单项选择题

How long has the man suffered from the symptoms he described

A．About one weeks.
B．About two weeks.
C．About three weeks.
D．About four weeks.
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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 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
单项选择题
Craig assured his boss that he would ______ all his energies in doing this new job.
A．call forth
B．call at
C．call on
D．call off
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