单项选择题


A．method
B．means
C．technique
D．way
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单项选择题
A．had been expressedB．expressedC．having been expressedD．being expressed
A．had been expressed
B．expressed
C．having been expressed
D．being expressed
单项选择题
A．effectiveB．efficientC．specialD．obvious
A．effective
B．efficient
C．special
D．obvious
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