,peopleinthiscityledacleanlife,butnowtheirlifeis...

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