this is the place___ we worked last year.答案是where.填in which为什么不对?

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this is the place___ we worked last year.答案是where.填in which为什么不对?
this is the place___ we worked last year.
答案是where.填in which为什么不对?

this is the place___ we worked last year.答案是where.填in which为什么不对?
in which=where 因为那是一空一词