单项选择题

A．understanding
B．improving
C．training
D．teaching
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单项选择题
A．therebyB．herebyC．howeverD．nevertheless
A．thereby
B．hereby
C．however
D．nevertheless
单项选择题
A．unworthyB．worthlessC．worthwhileD．worthy
A．unworthy
B．worthless
C．worthwhile
D．worthy
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