Who______hard in your class?A.works B.studys C.working D.studying

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Who______hard in your class?A.works B.studys C.working D.studying
Who______hard in your class?A.works B.studys C.working D.studying

Who______hard in your class?A.works B.studys C.working D.studying
A
空格部分是句子的谓语,所以应为动词,排除C和D,B拼写错误

B