单项选择题

All young men are required to do two years of ______ military service.

A．obliged
B．indispensable
C．compulsory
D．compelling
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单项选择题
During the wartime, anyone who ______ with enemies might be sentenced to be shot.
A．collaborated
B．merged
C．coincided
D．constituted
单项选择题
Even a very young animal has a strong ______ for self-preservation.
A．consciousness
B．impulse
C．instinct
D．response
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