单项选择题

A．come up
B．come across
C．come around
D．come on
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单项选择题
A．a littleB．littleC．muchD．a great deal
A．a little
B．little
C．much
D．a great deal
单项选择题
A．to knowB．knowingC．knowD．having known
A．to know
B．knowing
C．know
D．having known
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