单项选择题

The doctor enjoyed both his work and his life. He had never felt any __________ between these two things.

A．conflict
B．constrict
C．constraint
D．construct
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单项选择题
The government calls on young persons' __________ service to the national defense.
A．valuable
B．passionate
C．virtual
D．voluntary
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
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