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
The letter seemed ______ by a child.
A．to have written
B．to write
C．to be writing
D．to have been written
单项选择题
Much as______, I couldn't lend him the money because I simply didn't have that much Spare cash.
A．I would have liked to
B．I would like to have
C．I should have to like
D．I should have liked to
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