题目内容
________ used to be thought that the heavier objects fall to the ground faster than the light ones.
[ ]
A.
He
B.
What
C.
It
D.
That
答案:C
解析:
解析:
|
it是形式主语,代替后面的that引导的主语从句。 |
练习册系列答案
相关题目