问题补充：
Work hard and try to make what the teachers teach in class.
A. you
B. yours
C. us
D. ours
答案：
A. you
(答案→)B. yours
C. us
D. ours
解析：句意为：努力使老师教的内容变成你自己的知识。what the teacher teach是make的宾语，yours作make的宾语补足语。=your knowledge，所以选B。
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