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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单项选择题
The scheme was_________when it was discovered it would be very costly.
A．resigned
B．surrendered
C．released
D．abandoned
单项选择题
We find it impossible to ______ with the latest safety regulations.
A．accord
B．unify
C．obey
D．comply
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