Thank you for helping me. I       the final exam without your timely help.
A．have failedB．will failC．would have failedD．must have failed
C
本題考查虛擬語氣。Without your timely help可以轉(zhuǎn)換為if引導(dǎo)的條件從句的虛擬語氣。本句是對過去事情的虛擬，主句要用would/should/could/migh + have done。句意：謝謝你幫助了我。沒有你的及時(shí)幫助，我期末考試就不及格了。
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