what is known to all,smoking is harmful to our health1这句话对吗2改用As开头应怎么改3改用It开头应怎么改
问题描述：
what is known to all,smoking is harmful to our health
1这句话对吗
2改用As开头应怎么改
3改用It开头应怎么改
答
正确吧。
As what we've known to all, smoking is harmful to our health.
It is known that smoking is harmful to our health.
答
1.错了
2.As is known to all,smoking is harmful to our health
3.It is known to all that smoking is harmful to our health