Question

訪客

這邊的that是否可以改成which

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Answer 1

訪客

不行which就代表主詞而完整句是s+v+o 如果這邊用which等於跟Google Expeditions打到有兩個主詞
that雖然也可以當關代 可是他後面也可以有另一種用法直接接完整句(我通常會看成補充語意的概念)