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He calls at every house in the street once a month and always asks for a meal.前面为什么不用called
题目详情
He calls at every house in the street once a month and always asks for a meal.前面为什么不用called
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答案和解析
once a month 每月一次,表习惯,用一般现在时；而he为三单,故用calls
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