单项选择题
A．selections
B．collections
C．sources
D．origins
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单项选择题
A．IfB．AlthoughC．BecauseD．Before
A．If
B．Although
C．Because
D．Before
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单项选择题
A．Customer and salesman.B．Colleagues.C．Employee and boss.D．Classmates.
A．Customer and salesman.
B．Colleagues.
C．Employee and boss.
D．Classmates.
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