单选题
13.
I'm sorry ______ so long. I forgot to tell you in advance that I would have a meeting this afternoon.
A、
to keep you waited
B、
to keep you waiting
C、
to have kept you waiting
D、
to have kept you waited
【正确答案】
B
【答案解析】
抱歉让你等这么久，我忘记提前告诉你今天下午我有一个会议。I'm sorry to do sth. 意为很抱歉。
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