单项选择题


A．lessons
B．professors
C．jobs
D．employers
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单项选择题
A．thatB．whetherC．whenD．although
A．that
B．whether
C．when
D．although
单项选择题
A．arguedB．refutedC．challengedD．rejected
A．argued
B．refuted
C．challenged
D．rejected
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