【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(dāng)我走進(jìn)教室時(shí)，老師已經(jīng)開始講課了。A. By the time等到，到…時(shí)候?yàn)橹?/span>；B. As soon as一…就；C. After在……之后；D. Because因?yàn)椤?/span>by the time 當(dāng)…的時(shí)候，引導(dǎo)的時(shí)間狀語從句用一般過去時(shí)，主句用過去完成時(shí)。故答案選A。

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