用英语怎么说
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用英语怎么说
用英语怎么说
用英语怎么说
I don't know why.(一般现在时)现在仍不知道
I didn't know why.(一般过去时)过去不知道,现在知道
I don't know why.
I don't know why
I don't know why.
don't know why
I don't know the reason
I don't know why.
I don't know why ..
最标准的是
I don not know why.
I don'n know why.
I do not know why.