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

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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