单选题 In order not to be disturbed, I spent three hours ______ in my study.
A. locking B. locked
C. to lock D. being locked

【正确答案】 D
【答案解析】[解析] 动词用法
[解析] spend + 名词表示“花时间，度过”，例：I spend my spare time reading and fishing．这里 lock用被动形式be locked，指自己被自己锁起来。