【題目】I was doing my homework_______ the telephone rang. It was my aunt.

A. when B. while C. as D. as soon as

【答案】A

【解析】

試題分析：句意：我正在做作業(yè)，突然電話響了。是我的阿姨。這句話中使用的是固定句型be doing…when...,表示正在做某事……突然/這時……。While 和as都有當(dāng)……時候之義，但通常不與be doing連用；as soon as意為一……就……。故選A。

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