这是一个主语从句
they will manage to do it这个从句做主语
remains是系动词
to be seen是不定式做表语
就是主+系+表 的句型结构
在 How they will manage to do it remains to be seen.中：
在 How they will manage to do it remains to be seen.中：
在 they will manage to do it remains to be seen.中：they will manage to do it 是主语,be seen 是谓语,那么remains to 是什么?
在 they will manage to do it remains to be seen.中：they will manage to do it 是主语,be seen 是谓语,那么remains to 是什么?
英语人气：863 ℃时间：2019-08-22 11:56:32
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