to 后面可接句子吗？

xixiokok

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.  
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; R" a) E, G) L$ O3 z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
) X( N& I# A* r6 y4 U' ~it's necessary to acquire this.
7 a$ Y7 R0 g9 b2 N有必要（现在或以后）去获取这个
it's necessary to have acquired this.
1 x& Y) D% X& O- O- M5 \& h有必要目前已经获取了这个（具有这个是有必要的）

3 I' P' O4 k) D