My brother has some trouble __math.A.doing B.do C.did D.done

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Mybrotherhassometrouble__math.A.doingB.doC.didD.doneMybrotherhassometrouble__math.A.doingB.doC.didD.

My brother has some trouble __math.A.doing B.do C.did D.done
My brother has some trouble __math.A.doing B.do C.did D.done

My brother has some trouble __math.A.doing B.do C.did D.done
A

A doing . have trouble in doing something 是固定搭配,in可以省略。