【題目】They failed to finish the project in time. I regretted _________ them.

A. to be not able to help B. being not able to help

C. not being able to help D. not be able to help

【答案】C

【解析】考查動(dòng)名詞。 regret doing "遺憾做了某事" 跟動(dòng)名詞；regret to do sth.遺憾地去做某事。句意：他們沒(méi)有按時(shí)完成項(xiàng)目,我非常遺憾沒(méi)能幫上他們的忙。動(dòng)名詞的否定形式 not doing
所以選C。

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