单项选择题

The government calls on young persons' __________ service to the national defense.

A．valuable
B．passionate
C．virtual
D．voluntary
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单项选择题
The latest edition of The Complete Works of Lu Xun comes in 16 __________.
A．copies
B．volumes
C．versions
D．editions
单项选择题
The girl's honesty __________ her impulse from keeping the ring she found.
A．prohibited
B．forbad
C．refrained
D．controlled
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