The man was hurt badly,and he needed to o______

问题描述:

The man was hurt badly,and he needed to o______
首字母填空,答案是operating 为什么?

答案的确是operating on.
如果是to- - - - ,你就必须改写成:
- -- and he needed to be operated on.
记住这个结构:
The work needs / wants / requires TO BE DONE again
== The work needs / wants / requires DOING again填原型operate 行吗?不行,但可以这样:and the doctors needed to operate on him. (换一换主体对象)