单项选择题


A．wastes
B．conserves
C．uses
D．generates
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单项选择题
A．was foundB．foundC．has foundD．had found
A．was found
B．found
C．has found
D．had found
单项选择题
A．themB．whomC．thatD．which
A．them
B．whom
C．that
D．which
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