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we don't know how to do that.We don't know what makes us laugh
how 后边为什么加 to 而what后不加呢
人气:233 ℃ 时间:2020-07-05 12:32:08
解答
how to do that是不定式短语做宾语,也可以用how we can do that,是宾语从句.而what makes us laugh是宾语从句,且what 在从句中做主语,所以what 后面不加to.
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