单项选择题

A．attributing
B．contributing
C．distributing
D．explaining
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单项选择题
A．practiceB．memorizeC．learnD．persist
A．practice
B．memorize
C．learn
D．persist
单项选择题
A．in thatB．for whichC．with whomD．such as
A．in that
B．for which
C．with whom
D．such as
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