would you like to join us.的回答,选择哪个?为什么?1.of course not2.i am busy3.sorry,i won't4.sure.what is it?

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would you like to join us.的回答,选择哪个?为什么?
1.of course not
2.i am busy
3.sorry,i won't
4.sure.what is it?

choose number4
because this way is polite and also right in grammer