【題目】________ I walked into the classroom，the teacher had already started teaching.

A. By the time B. As soon as C. After D. Because

【答案】A

【解析】句意：當我走進教室時，老師已經(jīng)開始講課了。A. By the time等到，到…時候為止；B. As soon as一…就；C. After在……之后；D. Because因為。by the time 當…的時候，引導的時間狀語從句用一般過去時，主句用過去完成時。故答案選A。

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