优优班--学霸训练营 > 知识点挑题
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            • 1.
              --I think the paper is taking you a long time to write.
              --I ______ on it for almost a month now.(  )
              A.worked
              B.was working
              C.am working
              D.have been working
            • 2.
              Mary_____to writing classes every night since June and the course will end this week.(  )
              A.had gone
              B.has been going
              C.is going
              D.went
            • 3.
              They must be very tired now,for they ______ in the field the whole morning.(  )
              A.worked
              B.are working
              C.had worked
              D.have been working
            • 4. Because society ______ so rapidly during the last few years,the gap between the generations has become larger.(  )
              A.changed
              B.has been changing
              C.had changed
              D.was changed
            • 5. Over the years,while focusing on its own development,China _____ aid to the best of its ability to other developing countries with various difficulties.(  )
              A.provides
              B.is providing
              C.has been providing
              D.will provide
            • 6. _____in the queue for half an hour,the old man suddenly realized he had left the money in the car.(  )
              A.Waiting
              B.Having waited
              C.To wait
              D.To have waited
            • 7. --I’m sure Andrew will win the first prize in the final.

                  --I think so. He __________ for it for months.

               

              A.is preparing
              B.was preparing
              C.had been preparing
              D.has been preparing
            • 8.

              I ________ about what you"ve said and I"ve decided to take your advice.

              A.thought   
              B.have been thinking
              C.was thinking   
              D.had thought
            • 9.
              Over the years,while focusing on its own development,China _____ aid to the best of its ability to other developing countries with various difficulties.(  )
              A.provides
              B.is providing
              C.has been providing
              D.will provide
            • 10.
              A team of scientists _____ the effects of acid rain over the last twenty-year period.(  )
              A.studied
              B.had studied
              C.is studying
              D.has been studying
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