问题
选择题
_________ is known to us all that the earth is smaller than the sun.
A．It
B．What
C．As
D．which
答案
A
本题考查名词性从句。It在句中作形式主语，真正的主语为that the earth is smaller than the sun，故选A。
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_________ is known to us all that the earth is smaller than the sun.
A．It
B．What
C．As
D．which
A
本题考查名词性从句。It在句中作形式主语，真正的主语为that the earth is smaller than the sun，故选A。