题目列表(包括答案和解析)

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30. Not until he met with the difficulty _______ the importance of group work.

A. he realized      B. did he realize      C. realized he         D. he didn’t realize

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29. Mary got the first prize in the National Math Competition, ________, for sure, delighted everyone.

A. who             B. that              C. this              D. which

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28. ______ he had broken the record, he would be a world-famous runner now.

A. When             B. Because         C. If          D. Though

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27. -Was the driving pleasant when you vacationed in Mexico last summer?

-No, it _______ for four days when we arrived, so the roads were very muddy.

A. has rained         B. had been raining        C. rained           D. has been raining

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