单项选择题

He works in a sports centre instructing people in the use of the gym equipment.

A．helping
B．teaching
C．informing
D．ordering
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单项选择题
The workers finally called off the strike.
A．put off
B．ended
C．cancelled
D．participated in
单项选择题
Please be careful when you are drinking coffee in case you smudge the new carpet.
A．crash
B．pollute
C．contaminate
D．stain
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