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问题: 一道英语选择题

In order not to be disturbed, I spent three hours ______in my study.
A. locking B. Locked C. to lock
D. being locked
这道题目为什么选B,A 为什么不对,请解释

解答:

locked in my study是过去分词短语作后置定语,修饰I ,不能看成spend time doing 花费时间做某事
“为了不被打扰,我连续三天把自己锁在书房里。”(我被锁在屋里。)