there are many places of interest which attract millions tourists from all over the world every yea

题目

there are many places of interest which attract millions tourists from all over the world every yea
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为什么用which?places不是复数吗

答案

首先要明确,这个句子是一个定语从句,可以把句子成分分开来看,可能你会更明白一些：
There are many places of interest [which attract millions tourists( from all over the world.)]
句子的主干是：There are many places of interest.其中的用“[]”括到的部分是做的“places of interest” 的后置定语,用来修饰“places of interest”的,也就是说,places做的先行词,which做的引导词.句子意思是：“这里有很多每年吸引来自世界各地上百万游客的风景名胜.”就是这个意思.