呢度點解要加in?

基本上係一定要加的..
佢衣度的意思係話....在政府控制食物和貨物生產的一些國家裏的一個政治系統...
(如果就咁睇衣句句子就係咁解...)

if 冇左in, 就冇左 "係個d contries 裏" 衣個意思啦...

in which = where
so, which係錯, 因為係講country, 所以要用where
但係in which = where
所以要加in

2009-07-07 19:19:53 補充：
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Fionachanice 的答案大致是對的，話一定要加 "in"。不過有些少補充，正如 alaslee88 在意見中指出，"in" 是指 "in the political system" 而不是指 " in some countries"。

in(1) which the government controls the prodution of all food and goods.


in(1) refers to a political system<---------


the government controls the prodution of all food and goods IN 1) A POLITICAL SYSTEM.