【題目】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

【答案】B
【解析】句意：自從新規(guī)則被制定以來，在廢水進入河流之前，就已經(jīng)被處理干凈了。when當……時；ever since自從；after在……之后；before在……之前；主句中使用現(xiàn)在完成時，說明應(yīng)該使用ever since引導這個時間狀語從句。故B正確。

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