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

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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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