摘要：I am sorry to have kept you so long.
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I am sorry that I have kept you ________ me so long．
- A.waiting
- B.waiting for
- C.to wait
- D.to wait for
I am sorry that I have kept you ______ me so long.
[ ]
A. waiting
B. waiting for
C. to wait
D. to wait for
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B. waiting for
C. to wait
D. to wait for
I am sorry that I have kept you ________ me so long．
[ ]
A．waiting
B．waiting for
C．to wait
D．to wait for