答: it's worth后只能接 doing，表示某事值得做，而it's worthwhile 后才可以接 to do something，表示值得做某事，例如:
The book is worth reading because it's very instructive.(book既做主语又是reading的逻辑宾语)
It is worthwhile to see the film ，for it is very striking.
需要特别注意这两种句式的不同表达，something/ is worth doing，doing的宾语还是句子的主语
it's worthwhile to do something
我的答案是：it is worth to do 这句话的意思是值得做某事，但结构形式即语法书写上有错误，正确的答案应该为it is worth doing。
上面这道题考察的是worth的知识点。我们知道在短语be worth中，它后面跟动名词doing，是用主动语态来表示被动语态的。