關系詞只能選which

① 在非限制性定語從句中。

This is my favorite pen, which I bought yesterday.

② 先行詞不是一個詞，而是前面整個句子的概念時

The boy is very polite, which makes his parents happy.

③ 當先行詞指物，用“介詞+which”

This is the pen with which I often write.

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