单项选择题

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

A. That the sun and not the earth
B. It is the sun and not the earth
C. Being the sun and not the earth
D. The sun and not the earth
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单项选择题
Even though we had been to her house several times before, we still did not remember ______.
A. what street was it on

B. what was it the street
C. what street it was on

D. what street it was
单项选择题
He came back late, ______ which time all the guests had already left.
A. at

B. after

C. by

D. during
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