【記憶吐司】評論
of 後面放受格，所以挑which （關係代名詞的受格）
【dr.wen0512】評論
補充： 關係代名詞 ❝that❞ 前面不可接介系詞 〔正〕The chair on which he is sitting is very old. （他坐的那張椅子非常舊。） The chair that he is sitting on is very old. ＜此處用 that 時，前面不可加介系詞 on。＞ 〔誤〕The chair on that he is sitting is very old. 〔請勿使用本句！〕