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WhenIcameintotheroom,Ifoundhim____inwritinghisdoctoraldissertation.A.involvedB.involvingC.concentratedD.concentratingWhy
题目内容：
When I came into the room,I found him ____ in writing his doctoral dissertation.
A.involved B.involving C.concentrated D.concentrating
Why优质解答
这是一个固定表达式,Fund sb done 发现某人做某事.
A.involved B.involving C.concentrated D.concentrating
Why
优质解答
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