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To finish the homework, he spent four hours _______ in the s

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To finish the homework, he spent four hours _______ in the study.
A.locking B.locked C.locked himself D.to lock
B

考查非谓语动词。句中逻辑主语为he,与lock之间的关系为被动,故用过去分词。句意:为了完成家庭作业,他花了四个小时把自己关在书房里。