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

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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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