I am (sorry) that (I have kept) you (waited) so (long).

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问题 I am (sorry) that (I have kept) you (waited) so (long).

选项 A、sorry
B、I have kept
C、waited
D、long

答案C

解析 keep sb.doing sth.意为“使某人一直做某事”。改“waited”为“waiting”。
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