Thank you for giving me a hand. I ______ in the experiment without your valuable help.A. have failed B. will fail C. would have failed D. must have failed

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Thank you for giving me a hand. I ______ in the experiment without your valuable help.A. have failed      B. will fail    C. would have failed      D. must have failed

Thank you for giving me a hand. I ______ in the experiment without your valuable help.A. have failed B. will fail C. would have failed D. must have failed
Thank you for giving me a hand. I ______ in the experiment without your valuable help.
A. have failed B. will fail C. would have failed D. must have failed

Thank you for giving me a hand. I ______ in the experiment without your valuable help.A. have failed B. will fail C. would have failed D. must have failed
c.虚拟语气.没有你的帮助,我(可能已经失败)了

C

答案是 C 谢谢你帮了我,如果没有你的帮忙,我的试验将会失败。
帮忙在先,试验在后,所以用would, 表示都发生的了
同时也适合虚拟语气

答案:C
谢谢你的帮助,如果没有你有效的帮助,我的实验就不会成功。
这是一个过去将来完成时,用虚拟语气。语意有:幸好有你的帮助,我的实验才能成功。即,说这句话的时候,实验已经成功了。