'Didn't the council turn down Frank's proposal?' 'Yes. Now he regrets ______ it.'
A.to submit
B.to have submitted
C.having submitted
D.submitted

A.'
A.to
B.to
C.having
D.submitted

【参考答案】

C
解析：对已发生事情表示后悔用regretdoingsth。本句意是：“委员会没有拒绝弗兰克的提议吗?”“拒绝......

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