—______his second heart attack if he hadn’t smoked? —He might not have.

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问题 —______his second heart attack if he hadn’t smoked? —He might not have.

选项 A、Would he have had
B、Would he have
C、Had he had
D、Were he to have

答案A

解析 本题为虚拟过去时或叫非真实条件句过去时,条件句用过去完成时,作出与过去事实相反的假设,主句谓语用would/could/might have+动词的过去分词。
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