问题

I _______ you, but I was too busy then.
A:will help
B:helped
C:could have helped
D:should have;
B:helped
C:could have helped
D:should have;
正确答案是:
同类题型
.—— Have you _________ ? —— No, I got the wrong number.
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nockedat the door—I’ve no ideaI just pretended nobody was at home, so I didn’t ask who ____ was