单项选择题


A．complex
B．sophisticated
C．advanced
D．difficult
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单项选择题
A．workingB．predictingC．holdingD．managing
A．working
B．predicting
C．holding
D．managing
单项选择题
A．theseB．thoseC．suchD．other
A．these
B．those
C．such
D．other
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