单项选择题

When the engine would not start, the mechanic inspected all the parts to find what was at ______.

A．wrong
B．trouble
C．fault
D．difficulty
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单项选择题
They are going to have the serviceman ______ an electric fan in the office tomorrow.
A．install
B．to install
C．to be installed
D．installed
单项选择题
He failed to carry out some of the provisions of the contract, and now he has to ______ the consequences.
A．answer for
B．run into
C．abide by
D．step into
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