单项选择题


A．that
B．which
C．where
D．why
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单项选择题
A．whatB．whyC．thatD．whether
A．what
B．why
C．that
D．whether
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
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