单项选择题

A) in C) on
B) at D) for

A．in
B．at
C．on
D．for
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单项选择题
A) similar C) differential B) identical D) diverse
A．similar
B．identical
C．differential
D．diverse
单项选择题
A) work C) stay B) serve D) remain
A．work
B．serve
C．stay
D．remain
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