问题补充:
I am sorry to have you so long.
A. waited
B. to wait
C. waiting
D. to be waiting
答案:
A. waited
B. to wait
(答案→)C. waiting
D. to be waiting
解析:考查非谓语动词。have sb. doing sth让某人一直做某事,句意:对不起让你一直等这么久。故选C。
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