初中英语试题,I am sorry that I have kept you _____ so long.

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初中英语试题,I am sorry that I have kept you _____ so long.
A.waiting B.waiting for C.to wait
答案肯定是在A　B里面,但这里究竟需不需要带介词for　呢?

如果后面没有 so long 那么 waiting 就足够了
... that I've kept you waiting. 语义已经完整: 抱歉让您等了会儿.
有so long 则必须加介词 for. for so long ... for how long? for over 40 minutes.

初中英语试题,I am sorry that I have kept you _____ so long. I am t__ sorry I have kept you waiting long. I'm sorry I have kept you ______ so long. I'm sorry to have kept you waiting so long. I am sorry I _____(keep)you waiting so long. I am sorry to have kept you waiting so long.这句为什么用to have ke I'm sorry to have kept you waiting so long 和i' m sorry to ke I am sorry that I have kept you__________(等）for a long time I am sorry you have been waiting so long .BUT --i am sorry to have kept you waiting long ---never mind .i I'm _______(ture) sorry that I've kept you waiting so long I'm sorry.I have kept you ()for me so long.A:wait B:waiting