单项选择题

The young man assured the boss that he would ______all his energies to do the job well.

A．call on
B．call forth
C．call at
D．call off
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单项选择题
The new underground railway will______ the journey to all parts of the city.
A．consume
B．eliminate
C．formulate
D．facilitate
单项选择题
The oil must be used up,______ the light went out.
A．since
B．as
C．because
D．for
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