单项选择题


A．whiten
B．strengthening
C．whitening
D．strengthing
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单项选择题
A．admittedB．acceptedC．receivedD．taken
A．admitted
B．accepted
C．received
D．taken
单项选择题
A．whichB．thatC．themD．what
A．which
B．that
C．them
D．what
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