has體現(xiàn)三單,所以借助助動詞does進行否定.
正確：doesn't have to
He has to help his mother clean the house today 改為否定句
He has to help his mother clean the house today 改為否定句
He ------ ------- help his mother clean the house today.
He ------ ------- help his mother clean the house today.
英語人氣：451 ℃時間：2020-03-21 11:32:09
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