to 后面可接句子吗？

xixiokok

1 y# u  V2 U& W" g- \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.  

8 g; t1 @2 E# y! p" e( \0 m这句话里，necessary to 后面为什么可以接 have acquired a ...句子？
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江南一屁

没有接句子
it is necessary to have done sth.
* H6 X- |7 ^8 ^- [$ u3 x* E$ D接了个完成时的动宾结构
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你可以对比一下下面两句的含义
. p# ?# q4 v% U4 S( r& p$ b. xit'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.
" @, {: [$ w6 a3 U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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