题目内容：

A didn't go to the party not _(because/because of)the weather but _(because /because of)busy doing
请说明理由,急...
Sorry题目后部分是but_he didn't feel well.能补充回答吗!

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答案：because of,because.
because of和because区别如下：
1.because of视为一个介词,其后加名词/代词/动名词（短语）；
而because是一个连词,后面引导一个成分完整的原因状语从句（有自己的主谓宾语等）.
2.第一空后面,the weather就是一个名词短语“天气”,所以用介词短语because of；
而第二空后,he didn't feel well就是一个完整的句子,所以用连词because.