He fell of the bike while riding还是while he was riding?是不是都对?

问题描述:

He fell of the bike while riding还是while he was riding?是不是都对?
1个回答 分类:英语 2014-09-27

问题解答:

我来补答
都对
从句中省略了主谓语避免重复.
 
 
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