As we all know, it’s not polite to keep others _____ for a long time.
A. wait B. waited C. to wait D. waiting
As we all know, it’s not polite to keep others _____ for a long time.
A. wait B. waited C. to wait D. waiting
D
【解析】考查点：固定短语的用法。 解题思路：固定短语keep sb. doing sth.意为“使某人持续不停的干某事”，句意为“众所周知，让别人等很长时间是不礼貌的”，故答案选D；
【易错题】keep sb. doing sth. 表示“是某人继续不停的干某事”，常与make sb. do sth.(“使某人做某事”)混淆。