题目：
--I've been waiting for the phone from my uncle since 5 o'clock.
--________. He is not only a skillful driver but he also knows the road very well.
A．How long has he been away?
B．What's the matter with him?
C．I don't think you should worry about him.
D．I'm afraid there's something wrong with the telephone.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：各级排水沟槽
