单项选择题

His health had deteriorated while he was in prison.

A．became better
B．became worse
C．became stronger
D．became weaker
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单项选择题
The most crucial problem any economic system faces is how to use its scarce resources.
A．puzzling
B．difficult
C．terrifying
D．urgent
单项选择题
Smoking is inhibited in public places.
A．instructed
B．inquired
C．forbidden
D．strived
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