I don't think you can do it by yourself,( )A.do I B.can you C.can't you理由说明一下，谢谢！

I don't think you can do it by yourself,( )A.do I B.can you C.can't you理由说明一下，谢谢！
I don't think you can do it by yourself,( )
A.do I B.can you C.can't you
理由说明一下，谢谢！

I don't think you can do it by yourself,( )A.do I B.can you C.can't you理由说明一下，谢谢！
B.can you

B
前半句是否定意思， 后面用肯定形式提问
我不认为你能自己做好，你能吗？

B.can you