I could not have fulfilled the task in time if it ______ for your help.

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问题 I could not have fulfilled the task in time if it ______ for your help.

选项 A、had been
B、has been
C、was not
D、had not been

答案D

解析 本句为虚拟句,从句中表示与过去事实相反的假设时,须用过去完成时。
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