—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

試題分析： 句意：--真遺憾,他們的實(shí)驗(yàn)是一個(gè)失敗.—在更加有利的條件下他們本應(yīng)該做的更好。這里under more favorable conditions.是一個(gè)隱含的虛擬語(yǔ)氣,相當(dāng)于if they had been under more favorable conditions.說(shuō)明是和過(guò)去相反的虛擬條件句,所以主句是could have done“過(guò)去本可以做的更好”，所以選B。
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