已经有did在前面了,动词就用原型,而不用过去时态.did已经表示sleep这个动作是过去发生的了,所以不能再用slept,否则就是重复,是不对的.用汉语解释的话就是说“昨晚你睡了多久?” 不能再累赘的说成“昨晚你已经睡了多久?” 这里的“了”和“已经”是一个意思,都表示动作已经发生.“已经”就像“did”,“ 了”就像“slept”这个变型.这么说你明白了么?
How long did you ____(sleep) last night?为什么用sleep不用slept?
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