In the U.S, a tip is thought to be polite when paying the bill. A. leaveB. having leftC. l

发布时间：2020-08-17 04:08:09

In the U.S,     a tip is thought to be polite when paying the bill.
A. leave
B. having left
C. leaving
D. being left

网友回答

A. leave
B. having left
(答案→)C. leaving
D. being left
解析：句意：在美国当付账单时，留下一些小费被认为是有礼貌的。这里是动名词短语作主语，是通常的一种行为，所以用一般式就行，故选C。
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