单项选择题

______ recurring fear is out of proportion to any real danger, it is called a phobia.

A．When
B．Whereas
C．Which
D．Whether
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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
He failed to carry out some of the provisions of the contract, and now he has to ______ the consequences.
A．answer for
B．run into
C．abide by
D．step into
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