单项选择题


A．before
B．after
C．while
D．for
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单项选择题
A．requireB．acquiringC．acquiredD．required
A．require
B．acquiring
C．acquired
D．required
单项选择题
A．independentlyB．repeatedlyC．logicallyD．generally
A．independently
B．repeatedly
C．logically
D．generally
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