单项选择题

As teachers we should concern ourselves with what is said, not what we think ______.

A．ought to be said
B．must say
C．have to be said
D．need to say
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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
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
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