As we all know, it’s not polite to keep others for a long time.A. waitB. waitedC. to wait

发布时间：2020-08-20 22:59:21

As we all know, it’s not polite to keep others      for a long time.
A. wait
B. waited
C. to wait
D. waiting

网友回答

A. wait
B. waited
C. to wait
(答案→)D. waiting
解析：这里考核keep doing sth和keep sb doing sth结构。
注意：others这里是“别人”的意思。
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