单项选择题


A．on
B．in
C．with
D．to
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单项选择题
A．playingB．demonstratingC．showingD．exhibiting
A．playing
B．demonstrating
C．showing
D．exhibiting
单项选择题
A． No Smoking B． Non-Smokers C． No Smoke D． Non-Smoke
A．"No Smoking"
B．"Non-Smokers"
C．"No Smoke"
D．"Non-Smoke"
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