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Thewastewaterhasbeenmadecleanbeforeitgoesintotheriver

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问题详情:

Thewastewaterhasbeenmadecleanbeforeitgoesintotheriver

The waste water has been made clean before it goes into the river ______ the new rule was made.

  A. when                B. ever since       C. after               D. before

【回答】

B

知识点:连词

题型:选择题

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