单项选择题
A.clean
B.dirty
C.harmful
D.pollution
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单项选择题
A.otherB.anotherC.othersD.the other
A.other
B.another
C.others
D.the other
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单项选择题
A.findB.foundC.looked forD.looking for
A.find
B.found
C.looked for
D.looking for
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