问题
选择题
I am sorry to have you ________ so long.
A．waited
B．to wait
C．waiting
D．to be waiting
答案
答案：C
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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I am sorry to have you ________ so long.
A．waited
B．to wait
C．waiting
D．to be waiting
答案：C
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。