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

A. whenB. ever sinceC. after D. before

【答案】B

【解析】

試題分析：考查連詞。when當(dāng)……時(shí)；ever since自從；after在……之后；before在……之前；句意：自從新規(guī)則被制定以來，在廢水進(jìn)入河流之前，就已經(jīng)被處理干凈了。主句中使用現(xiàn)在完成時(shí)，說明應(yīng)該使用ever since引導(dǎo)這個(gè)時(shí)間狀語(yǔ)從句。故B正確。

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