问题
选择题
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
答案
A
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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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
A
句中it作形式主语,真正的主语是由that 引导的从句。