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【题目】I was doing my homework ________ someone knocked at the door.

A.whileB.asC.atD.when

【答案】D

【解析】

句意:我正在做作业, 这时候有人敲门。

考查从属连词。while当……时候;as随着;at是介词,意为“在……”;when当……时候。be doing...when...意为“正在……这时候.……”,在此句型中表示“正要做某事,恰好when 后面的那件事情发生”,when意为“这时候”,强调后边的动作突然发生。故选D

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