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
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