因为,that / which后的从句中you是主语;
如果不是,那么,that / which后面应直接加动词,此时,that/ which就作主语.
例:
the package that/which you are carrying is about to come unwrapped
1. Is he the man who/that wants to see you?他是那个男人想见你?(who/that在从句中作主语) 2. He is the man whom/ that I saw yesterday. 他就是我昨天见的那个人。(whom/that在从句中作宾语)
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