to 后面可接句子吗？

xixiokok

: Q7 e& ]$ e# G2 j, @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

9 T) |0 q7 D6 s, A没有接句子
2 m* d: U) b5 Wit is necessary to have done sth.
接了个完成时的动宾结构
8 h( W8 {7 u0 d# S
  m  b/ j- A, q9 r你可以对比一下下面两句的含义
it's necessary to acquire this.
有必要（现在或以后）去获取这个
' s) L# t6 A/ J8 N$ P% Pit'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）

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