单项选择题

______is the center of our planetary system was a difficult concept to grasp in the Middle Ages.

A．It is the sun and not the earth
B．Being the sun and not the earth
C．The sun and not the earth
D．That the sun and not the earth
<上一题 目录 下一题>
热门 试题

单项选择题
I decided to go to the library as soon as I ______
A．finish what I did
B．finished what I did
C．finished what I was doing
D．would finish what I was doing
单项选择题
Hardly a month goes by without______ of another survey revealing new depths of scientific illiteracy among US citizens.
A．words
B．word
C．a word
D．the word
相关试题