单项选择题


A．in
B．on
C．of
D．about
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单项选择题
A．to knowB．knowingC．knowD．having known
A．to know
B．knowing
C．know
D．having known
单项选择题
A．bringingB．takingC．ensembleD．organizing
A．bringing
B．taking
C．ensemble
D．organizing
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