waste water was put into the rivers and lakes, which were badly polluted. A. At one time ——青夏教育精英家教网—

摘要： waste water was put into the rivers and lakes, which were badly polluted. A. At one time B. At a time C. One time D. A time

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（2010·江苏省如东高级中学高三国庆假期自主练习二） 3. ________waste water was put into the rivers and lakes, which were badly polluted.

A. At one time B. At a time C. One time D. A time

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