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 old farmer was run down by a car. He was taken to the hospital and______ on by the chief surgeon right now.
A．operated
B．having been operated
C．is operated
D．is being operated
单项选择题
The three men tried many times to sneak across the border into the neighboring country, ______by the police each time.
A．had been captured
B．being always captured
C．only to be captured
D．unfortunately captured
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