单项选择题

A．business
B．duty
C．leave
D．service
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单项选择题
A．changedB．replacedC．substitutedD．transplanted
A．changed
B．replaced
C．substituted
D．transplanted
单项选择题
A．apparentlyB．naturallyC．efficientlyD．sufficiently
A．apparently
B．naturally
C．efficiently
D．sufficiently
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