What would you do if you injured your knee while--?A.run B.r

问题描述:

What would you do if you injured your knee while__?A.run B.runs C.ran D.running 求详解
1个回答 分类:英语 2014-11-28

问题解答:

我来补答
D.while后面一般加动词现在分词形式.
 
 
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