单选题
I could not have fulfilled the task in time if it for your help.
A、
had been
B、
has been
C、
was not
D、
had not been
【正确答案】
D
【答案解析】
解析：句意：要不是你的帮助，我就不能及时完成这项任务。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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