一道高中英语单选题3.isknowntousallisthatChinahaslaunchedShenzhouVspaceshipsuccessfully.A.ThatB.WhatC.ItD.As请问为什么是主语从句我选的C不行吗为什么是B

Question

一道高中英语单选题
3.______ is known to us all is that China has launched Shenzhou V spaceship successfully.
A.That B.What C.It D.As
请问为什么是主语从句 我选的C不行吗 为什么是B

Answer 1

B.What 为正确选项.
what is known to us all是个主语从句,因为主语是一个句子,C,不对,如果没有后面的is,则C才是对的,即It is known to us all that China has launched Shenzhou V spaceship successfully.这也是个主语从句,it是形式主语,真正的主语是后面的that China has launched Shenzhou V spaceship .
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