—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

 

B

【解析】

試題分析： 句意：--真遺憾,他們的實驗是一個失敗.—在更加有利的條件下他們本應該做的更好。這里under more favorable conditions.是一個隱含的虛擬語氣,相當于if they had been under more favorable conditions.說明是和過去相反的虛擬條件句,所以主句是could have done“過去本可以做的更好”，所以選B。

考點：考查含蓄的小虛擬條件句

 

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