you_____finish all the tasks in the liimited time A don‘t haveB dont' have to C haven’t toD doesn't have to

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you_____finish all the tasks in the liimited time A don‘t haveB dont' have to C haven’t toD doesn't have to
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 haveB dont' have to C haven’t toD doesn't have to
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

A 你在规定时间内没有完成所有的任务。don‘t have 是 do not have 的缩写形式

B不必要