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  3. I would have helped him solve the problem , but I was so busy then.

I would have helped him solve the problem , but I was so busy then.

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问题 I would have helped him solve the problem , but I was so busy then.
选项 A、if it’s possible
B、if it has been possible
C、has it been possible
D、had it been possible
答案B
解析 虚拟条件句的倒装形式。
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