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Every possible means , but the teacher as well as the students worked out the ma

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Every possible means , but the teacher as well as the students worked out the ma

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

试题答案

c