单项选择题


A．business
B．duty
C．leave
D．service
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单项选择题
A．remainedB．remainsC．retainedD．retains
A．remained
B．remains
C．retained
D．retains
单项选择题
A．apparentlyB．naturallyC．efficientlyD．sufficiently
A．apparently
B．naturally
C．efficiently
D．sufficiently
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