to 后面可接句子吗？

xixiokok

! ?7 c# y( m8 H9 j. S$ k3 H; Q2 ~In order to design policies that aim to change commuting practices it is, however,necessary to have acquired a good understanding of the trips in question and their determinants.  

这句话里，necessary to 后面为什么可以接 have acquired a ...句子？

江南一屁

没有接句子
it is necessary to have done sth.
接了个完成时的动宾结构

你可以对比一下下面两句的含义
, Z' g; p3 j8 @! f6 ^9 nit's necessary to acquire this.
有必要（现在或以后）去获取这个
it's necessary to have acquired this.
有必要目前已经获取了这个（具有这个是有必要的）


" A" U' |) i8 ]  [! Z; p( X3 n