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

A.whileB.asC.atD.when

【答案】D

【解析】

句意:我正在做作業(yè), 這時候有人敲門。

考查從屬連詞。while當(dāng)……時候;as隨著;at是介詞,意為“在……”;when當(dāng)……時候。be doing...when...意為“正在……這時候.……”,在此句型中表示“正要做某事,恰好when 后面的那件事情發(fā)生”,when意為“這時候”,強調(diào)后邊的動作突然發(fā)生。故選D。

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