单项选择题

_______ is the center of our planetary system was a difficult concept to grasp in the Middle Age.

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
_______ the two, Maiy is _______ dancer.
A．Of, the more gifted
B．Of, more gifted
C．In, the more gifted
D．In, more gifted
单项选择题
There is a way _______ he can be saved.
A．whereas
B．whereby
C．while
D．thereafter
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