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
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单项选择题
Even though we had been to her house several times before we did not remember ______.
A．what street it was on
B．what the street it was on
C．what street was it on
D．what a street it was on
单项选择题
The teacher was ______ by his own inability to answer such a simple question.
A．distressed
B．mortified
C．surprised
D．satisfied
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