单项选择题

On a rainy day I was driving north through Vermont ______ I noticed a young man holding up a sign reading "Boston".

A．which
B．where
C．when
D．that
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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
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