Thank you for giving me a hand. I ______ in the experiment without your valuable

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问题 Thank you for giving me a hand. I ______ in the experiment without your valuable help.

选项 A、have failed
B、will fail
C、would have failed
D、must have failed

答案 C

解析由句意可知，帮助是发生在过去，故为与过去事实相反的假设，所以应该用would have done结构，故选C。

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