单项选择题


A．own
B．another
C．other
D．else
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单项选择题
A．notB．withC．withoutD．but
A．not
B．with
C．without
D．but
单项选择题
A．experimenting withB．experimenting onC．experimented withD．experimented on
A．experimenting with
B．experimenting on
C．experimented with
D．experimented on
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