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you_____finish all the tasks in the liimited time A don‘t ha

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you_____finish all the tasks in the liimited time A don‘t haveB dont' have to C haven’t to
D doesn't have to
you_____finish all the tasks in the liimited time A don‘t ha
have to 是固定搭配,表示“不得不”否定形式为don't have to,所以选B
再问: 为啥不选C和D
再答: have to 的否定形式就是don't have to 所以C被排除掉,至于D项,You是主语,是第二人称,谓语动词要用复数,如果主语是he或者she 就可以选D了