问题描述：
what在从句当中的用法
请问这两个句子那个对?1.i want to know what is the difference between a and b.2.i want to know what the difference between a and b is.
请问这两个句子那个对?1.i want to know what is the difference between a and b.2.i want to know what the difference between a and b is.
问题解答：
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