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单项选择题


A．had been expressed
B．expressed
C．having been expressed
D．being expressed
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单项选择题A．effectiveB．efficientC．specialD．obvious

A．effective
B．efficient
C．special
D．obvious

单项选择题A．puzzleB．doubtC．wonderD．guess

A．puzzle
B．doubt
C．wonder
D．guess