单项选择题

By the year 2000, production in the area is to double ______ of 1990.

A．that
B．it
C．one
D．what
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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
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
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