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Everypossiblemeans

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問題詳情:

Everypossiblemeans

Every possible means_____, but the teacher as well as the students _____worked out the math problem yet .

A. has tried ; haven’t         B. have tried; haven’t

C. has been tried; hasn’t      D. have been tried; hasn’t

【回答】

c

知識點:現在完成時及其被動式

題型:選擇題