His mother found him _______ inventing different kinds of things.

His mother found him _______ inventing different kinds of things.

题目
His mother found him _______ inventing different kinds of things.
A.good with B.being good at C.to be well in D.good at
已知答案是D,但不明白为何选D.希望有高人可以给出选D的详细原因.
答案
这到题应用的不是found sb do sth 这个短语
首先be good at 是系表结构的短语,但是found 接宾补时要把be动词去掉因此要说found him good at
另外found sb加adj时,也要直接加而不要be动词(原因和上面一样)
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