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
If you______ change your mind, please let us know.
A．shall
B．should
C．will
D．would
单项选择题
My father has promised to put his car entirely at our ______ for the holiday.
A．disposal
B．usage
C．pleasure
D．disposition
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