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
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单项选择题
______seeing the damage he had done, the child felt ashamed.
A．By
B．On
C．At
D．For
单项选择题
Remember that customers don't______about prices in that city.
A．debate
B．consult
C．dispute
D．bargain
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