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