-What a pity! Their experiment is a failure.-They better under more favorable conditions.A. should have doneB. could have done C. must have doneD. 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 doneB. could have done C. must have doneD. may have done

【解析】

试题分析：句意：--真遗憾,他们的实验是一个失败.—在更加有利的条件下他们本应该做的更好。这里under more favorable conditions.是一个隐含的虚拟语气,相当于if they had been under more favorable conditions.说明是和过去相反的虚拟条件句,所以主句是could have done“过去本可以做的更好”，所以选B。

考点：考查含蓄的小虚拟条件句

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