单项选择题

Bill 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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单项选择题
Pop music is such an important part of society ______ it has even influenced our language.
A．as
B．that
C．which
D．where
单项选择题
Dr. Wang has made much contribution to the theories of modem physics at the ______ of his health.
A．cost
B．disposal
C．mercy
D．expenditure
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