问题: 单选20
______ is known to us all is that China has launched Shenzhou VI spaceship successfully.
A.That B.What
C.It D.As
解答:
虽然有搭配:It is known to us all.和As is known to us all.
都翻译为:众所周知.
但是前一个做状语,后一个为"as"引导的定语从句.
分析句子成分:[______ is known to us all] is that China has launched Shenzhou VI spaceship successfully.
[ ]为主语.所以这里应由"what"引导主语从句.
选B
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