Both men genuinely regretted ____.(b) to have to leave(c) having to leave请问这两个中 为什么B 不可以?

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Both men genuinely regretted ____.
(b) to have to leave
(c) having to leave
请问这两个中 为什么B 不可以?

b
regret to do sth 后悔去做某事,还未做.
regret doing sth 后悔做过某事 做过了.