student asking question

この at はどういう使われ方をされていますか。

teacher

Native speaker’s answer

Rebecca

Yes, it is necessary to put "at" before "which" here. The preposition "at" is used in this sentence because it forms a prepositional phrase with the object of the preposition "which". "Which" introduces a relative clause, and the prepositional phrase "at which" combines two sentences into a single sentence. Ex: I went to a store at which sold winter clothes. Ex: This is the hospital at which I work.

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