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 Thewastewaterhasbeenmadecleanbeforeitgoesintotheriver ...

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問題詳情：

 Thewastewaterhasbeenmadecleanbeforeitgoesintotheriver ...

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

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

【回答】

B

知識點：連詞

題型：選擇題

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