It is well known to us all China sent up a manned spaceship to outer space successfully l

发布时间：2020-08-17 13:15:35

It is well known to us all      China sent up a manned spaceship to outer space successfully last year.
A. that
B. what
C. which
D. when

网友回答

A. that
B. what
C. which
D. when
解析：句中it作形式主语,真正的主语是由that 引导的从句。  
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