【題目】What were you doing ________ the teacher came in?
A.where
B.until
C.while
D.when

【答案】D
【解析】句意是:當老師進來的時候你在干什么?由when引導的時間狀語從句,主句用過去進行時,從句應(yīng)用一般過去時;如果從句和主句的動作同時發(fā)生,兩句都用過去進行時的時候,多用while引導。where 和 until 均不符合句意,故選D。

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