11．He was about to go to bed __________ the door bell rang．（　　）
A．asB．whenC．whileD．and

分析 他正要睡覺，就在那時門鈴響了．

解答 答案：B．根據(jù)He was about to go to bed 可知用be about to do…when表示正要做某事的時候，另一個動作發(fā)生了，所以答案是B．

點評 考查從屬連詞．when可以用作類似并列連詞，表示at that time，常用于be about to do…when，hardly…when，be doing…when等句型中．如：
　　We were swimming in the lake when suddenly the storm started．

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