his mother is ill in bed .so he help his mother ______the housework on weekdays

his mother is ill in bed .so he help his mother ______the housework on weekdays

题目
his mother is ill in bed .so he help his mother ______the housework on weekdays
1.have to,to do 2.has to,do 3.has to,with 4.has ,with
答案
3has to with
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