If it __________ possible, I would have helped him, but I was too busy.A.is B.wa

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问题 If it __________ possible, I would have helped him, but I was too busy.

选项 A.is
B.was
C.were
D.had been

答案D

解析考查虚拟语气。根据“would have helped”可以断定是发生在过去的事情,所以应该选had been.but后面的句子是干扰项,后面只是在陈述“我当时很忙”这个事实,和虚拟语气的时态无关。
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