题目内容

As we all know, it’s not polite to keep others_________for a long time.
A．waitB．waitedC．to waitD．waiting
D
这题考查非谓语的用法：keep sb doing“让某人一直做某事”，句意是：我们都知道，让别人等很长时间是不礼貌的。选D。
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