单项选择题

It was no ______ that his car was seen near the bank at the time of the robbery.

A．coincidence
B．convention
C．certainty
D．complication
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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
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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