单项选择题


A．pick
B．select
C．learn
D．study
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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．meetB．to meetC．to have metD．meeting
A．meet
B．to meet
C．to have met
D．meeting
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