One of the boys doing homework in the classroom.A. is; their B. are; his C. is; his

发布时间：2020-08-20 19:46:34

One of the boys      doing      homework in the classroom.
A. is; their      B. are; his      C. is; his

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解析：本题的含义为其中有一个男孩正在教室里做他的作业，主语为单数第三人称，故本题用is，他的物主代词为his，故本题选C。
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