【題目】They failed to finish the project before the deadline. I regretted __________.

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

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

【答案】C

【解析】句意:他們沒(méi)能在截止日期前完成這個(gè)項(xiàng)目，我后悔沒(méi)能幫助他們。regret doing sth. 后悔曾經(jīng)做過(guò)某事。

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