This is___heavy a box ___no one can lift it.答案是such as 还有几个问题I cannot help ___ the work for him.He is breaking the law.I cannot help ___ the work for him.He is too young to do it.A.do B.to do C.doing D.A or B感激不尽!标题没有it 还有 fit的用法，fit和be fit for 有什么区别？

This is___heavy a box ___no one can lift it.
答案是such as 还有几个问题
I cannot help ___ the work for him.He is breaking the law.
I cannot help ___ the work for him.He is too young to do it.
A.do B.to do C.doing D.A or B
感激不尽!
标题没有it
还有 fit的用法，fit和be fit for 有什么区别？