Before the Wright brothers invented the plane,men ( ) fly.A.

问题描述:

Before the Wright brothers invented the plane,men ( ) fly.A.could not B.can not
1个回答 分类:英语 2014-10-06

问题解答:

我来补答
A could not
再问: 给点说明,谢谢!
再答: invented 是过去式 所以填 could not (can not 的过去式)
 
 
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