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
I don' t doubt ______ he will come on time.
A．whether
B．which
C．what
D．that
单项选择题
Bob was completely ______ by the robber' s disguise.
A．taken away
B．taken down
C．taken to
D．taken in
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