He often helps his mother ____ housework over the weekend.A.do B.does C.did D.doing

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• He often helps his mother ____ housework over the weekend.
• He often helps his mother ____ housework over the weekend.A.do B.does C.did D.doing
• i often help my mother _______the housework A do B to do
• my mother often does housework in the morning （用now把句子改为现在进行时 ）