中文谷,peopleinthiscityledacleanlife,butnowtheirlifeis...
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问题详情：
, people in this city led a clean life, but now their life is disturbed by the heavy pollution.
A．At one time B．At a time C．At no time D．At all times
【回答】
A
知识点：词组 短语
题型：选择题
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