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    精英家教网 > 高中英语 > 题目详情
    —What a pity! Their experiment is a failure.
    —They ________ better under more favorable conditions.
    A．should have doneB．could have doneC．must have doneD．may have done
    B

    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。
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