单项选择题


A．study
B．discuss
C．record
D．rememder
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单项选择题
A．whichB．in thatC．on whichD．in which
A．which
B．in that
C．on which
D．in which
单项选择题
A．untilB．whileC．beforeD．when
A．until
B．while
C．before
D．when
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