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            • 1．

              When a tomb is opened, fresh air disturbs the viruses, which, if ______in, can result in illness or even death.

              A．having breathed     
              B．to breathe       
              C．breathed     
              D．breathing.
              难度：中等
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            • 2．

              Though ______ time and time again of the danger, he turned a deaf ear to them.

              A．warned
              B．being warned         

              C．he warned               

              D．was warned
              难度：中等
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            • 3．
              _______ available, many people would have died from sickness or even small wounds.

                

              A．If penicillin would not be           
              B．Were penicillin not
              C．Had penicillin not been                
              D．If penicillin should not be
              难度：中等
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            • 4．

              —What is upsetting you, dear?

                 —______ it is necessary for us to move our home to the city now.

              A．When
              B．How
              C．Where
              D．Whether
              难度：中等
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            • 5．
              Once b____________ by a dog, you should go to the hospital immediately.
              难度：中等
              解析 收藏 试题篮
            • 6．
              It might have saved me the trip ______ the access through the Internet.

               

              A．did I know         
              B．have I known    
              C．should I know      
              D．had I known
              难度：中等
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            • 7． I was wondering if we could go skating on the weekend.
              — _____ good.
              [     ]

              A. Sound
              B. Sounded
              C. Sounding
              D. Sounds
              难度：中等
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