My brother has some trouble( ) maths A doing B do C did D done理由

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Mybrotherhassometrouble()mathsAdoingBdoCdidDdone理由Mybrotherhassometrouble()mathsAdoingBdoCdidDdone理由

My brother has some trouble( ) maths A doing B do C did D done理由
My brother has some trouble( ) maths A doing B do C did D done
理由

My brother has some trouble( ) maths A doing B do C did D done理由
doing
have trouble doing sth.

doing固定搭配

选A has trouble (in) doing sth