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
I'm sure he is up to the job______he would give his mind to it.
A．if only
B．in case
C．until
D．unless
单项选择题
______seeing the damage he had done, the child felt ashamed.
A．By
B．On
C．At
D．For
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