题目列表(包括答案和解析)
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
29. Mary got the first prize in the National Math Competition, ________, for sure, delighted everyone.
A. who B. that C. this D. which
28. ______ he had broken the record, he would be a world-famous runner now.
A. When B. Because C. If D. Though
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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