单项选择题

It was felt that he lacked the ______ to pursue a difficult task to the very end.

A．petition
B．engagement
C．commitment
D．qualification

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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

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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