问题

You were brave enough to argue with Mr. Smith. —Well, now I regret _______ that.

A:to do
B:to be doing
C:to have done
D:having done

正确答案是：

同类题型

Don’t worry. I’m sure your missing glasses will ______ sooner or later.

It is not what he said but the way he said it______annoyedme

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People, with the young ________, love to surf the Internet for entertainment.