题目列表(包括答案和解析)
I'm sorry to have kept you______________.
[ ]
A. wait B. waited C. waiting D. to wait
I’m sorry to have kept you _____ so long. Now let’s get down to business.
A. waiting B. to wait C. have waited D. from waiting
I'm sorry to have kept you ________ for so long a time.
[ ]
I'm sorry ____ so long, I forgot to tell you in advance where I had put my key.
A. to keep you wait B. to keep you waiting
C. to keep you waited D. to have kept you waiting
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