题目内容
I am sorry to have you ________ so long.
| A.waited | B.to wait | C.waiting | D.to be waiting |
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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题目内容
| A.waited | B.to wait | C.waiting | D.to be waiting |