语法：They have long tails for keeping balance when climbing the tree.
When doing?为何省略they are 什么情况下可以省略
人气：339 ℃ 时间：2020-05-14 13:12:28
解答
为何省略they are?答：这是when引导的时间状语从句的省略形式.这句话中,从句补充完整即为when they are climbing the tree.主句主语是They,从句主语也是they,且包含be动词are,所以要省略.什么情况下可以省略?答：状...
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