2. 外语
  3. Had it not been for his help, I ______ the task within such a short time.

Had it not been for his help, I ______ the task within such a short time.

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问题 Had it not been for his help, I ______ the task within such a short time.
选项 A、can’t complete
B、couldn’t complete
C、wouldn’t complete
D、couldn’t have completed
答案D
解析 本句是与过去相反的虚拟语气。从句用had done的形式，主句则用would/could/should/might+have done的形式。
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