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            • 1． Engineers_______ their research _______ to be completed by the end of the year, and luckily made it just before the severe winter came.
              A．were stepping up; was due                                                                
              B．stepped up; which was due
              C．have stepped up; due                                                       
              D．had stepped up; due  
              难度：中等
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            • 2． -- John, where did you go for your summer vacation?
                -- I ___________ busy with my study for months, so I went to the beach to get relaxed.
              A．was                                                       
              B．will be                                         
              C．have been                                         
              D．had been
              难度：中等
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            • 3． The local government expressed their thanks for the aid they ______ these days．
                     A．would receive     B．are receiving      C．have received        D．had received
              难度：中等
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            • 4． I thought I _______ my cell phone somewhere. But it is on the back seat of my car.
                A. had lost         B. would lose       C. have lost        D. lose
              难度：中等
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            • 5．  He can’t have caught the early train because the early train _____when he _______there.
              A．left; had arrived     
              B．has left; arrives     
              C．left; arrived      
              D．had left; arrived
              难度：中等
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            • 6． He’s already gone home．But before he left．He_________all the mistakes in his paper
              A．would correct    
              B．has corrected    
              C．corrected    
              D．had corrected
              难度：中等
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            • 7． I was just going to cut my rose bushes but someone          it．Was it you?
              A．has done                
              B．had done            
              C．would do           
              D．will do
              难度：中等
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            • 8．  Maybe if I _______ science, and not literature then, I would be able to give you more help.
                 A. studied            B. would study       C. had studied                D. was studying
              难度：中等
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            • 9．

               — Got your driving license?

                  — No. I            too busy to have enough practice, so I didn’t take the driving test last week.

              A. was        B. have been       C. had been        D. am

               

              难度：易
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            • 10． By the time he was 15, he _________ advanced maths on his own. It was the reason that he could solve the difficult problem.
               A. studied   B. had studied   C. was studying   D. has studied
              难度：中等
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