-What a pity! Their experiment is a failure.-They better under more favorable conditions.A. should have done B. could have doneC. must have done D. may have done 题目和参考答案——青夏教育精英家教网—

题目内容

—What a pity! Their experiment is a failure.

—They ________ better under more favorable conditions.

A. should have done B. could have done

C. must have done D. may have done

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