Jackdoinghomework． A．is，...

Jack________doing________homework．

A．is，her

B．is，my

C．isn’t，his

D．isn’t，my

C 【解析】固定搭配“做作业”可用do one’s homework，one’s要与主语在人称上保持一致，Jack是男性且为第三人称单数，其物主代词是his，故选C。

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Jack________doing________homework． A．is，...