单项选择题

A．what
B．why
C．that
D．whether
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单项选择题
A．rub upB．rub offC．rub awayD．rub against
A．rub up
B．rub off
C．rub away
D．rub against
单项选择题
A．beforeB．whenC．afterD．unless
A．before
B．when
C．after
D．unless
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