应选B
从语法角度讲,AB都行,都是表示过去做某件事,前面的was表示整个句子是一般过去时.但这个题目要结合句意,把AB都带进去看看：
A.当我在学校时,我习惯熬夜很晚读故事书
B.当我在学校时,我曾经熬夜很晚读故事书
大概的说两个都行（都能表示过去）,但严格一点,B更符合句意,所以应选B
（注：你最好问一下老师,这个题目是不是有问题）
be used to doing sth 习惯于做什么事
used to do/be sth 曾经做过某事/曾经是某样
when I was at school .I up very late.reading story-books .
3个回答
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