Because he is helpful,so he often helps others错在哪
问题描述：
Because he is helpful,so he often helps others错在哪
答
Because 和 so保留一个即可，不能同时用。
答
because 和so不能这样使用,两个选一个就行.
He is helpful,so he often helps others.
Because he is helpful,he often helps others.
另外,这句话本身,就英语习惯来讲很别扭,其实说的是一件事,重复啊.