17. ―What a pity! Their experiment is a failure.

―They    better under more favourable conditions.

A. should have done    B.  could have done

C.  must have done      D.  may have done

17.   B考查含蓄的虛擬條件句。句意:"真遺憾!他們的實(shí)驗(yàn)失敗了。""在更加有利的條件下,他們本能做得更好。"這里under more favorable conditions是一個(gè)隱含的虛擬條件句, 相當(dāng)于if they had been under more favorable conditions。 這是和過(guò)去事實(shí)相反的虛擬條件句,所以主句用could have done的形式。could have done表示過(guò)去原本能夠做某事而實(shí)際上并沒(méi)有做。所以選B。

題目來(lái)源:2015全品語(yǔ)法快練高中英語(yǔ)新課標(biāo) > 訓(xùn)練25 情態(tài)動(dòng)詞和虛擬語(yǔ)氣

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