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The man was hurt badly,and he needed to o______

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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
再问: 填原型operate 行吗?
再答: 不行,但可以这样: and the doctors needed to operate on him. (换一换主体对象)