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

分析 他正要睡覺(jué)，就在那時(shí)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(shí)候，另一個(gè)動(dòng)作發(fā)生了，所以答案是B．

點(diǎn)評(píng) 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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