______ smoking, he would not have got cancer in the lung.
A．Was he given upB．Had he given up
C．Did he giveD．If he gave up
B
是因?yàn)闀r(shí)態(tài)前后有矛盾。由于主句謂語(yǔ)是would not have got，這表明是對(duì)過(guò)去事實(shí)作出的假設(shè)，所以從句謂語(yǔ)應(yīng)該是 had given up，而不是像D項(xiàng)那樣用一般過(guò)去時(shí)。另外，當(dāng)虛擬條件句中有 had, should, were 等詞時(shí)，通常可以省略 if，并將 had, should, were 提前置于句首。
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