单项选择题

A．produced
B．created
C．improved
D．facilitated
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单项选择题
A．idealizedB．recognizedC．supervisedD．summarized
A．idealized
B．recognized
C．supervised
D．summarized
单项选择题
A．themB．thoseC．whichD．that
A．them
B．those
C．which
D．that
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