______ those bad habits, he would not have got liver cancer.A、Was he giving upB

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问题 ______ those bad habits, he would not have got liver cancer.

选项 A、Was he giving up
B、Did he give up
C、If he gave up
D、Had he given up

答案 D

解析这句话用的是过去虚拟语气，主句用would have done，条件从句用if… had done。而if可省略，把had提前放到句首。注意：下表是虚拟语气的基本结构：
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