Question

请问这个语法点The study argues that the type of action needed again

Answer 1

that不可以省略,这里that是一个比较的用法,和the type of action 形成比较,

用being因为表示正在被：这里省略了 which is 即：which is being taken against AIDS.

希望能帮到您,

如果要省略that的话,应该作修改：

The study argues that the type of action needed against passive smoking should be similar to what is being taken against AIDS