【定语从句Theterribleshakingofthebuildingwokeupallthepeoplewhowereasleep.先行词不是allthepeople吗?有个all来修饰了怎么还用who引导不用that啊?】

　　定语从句Theterribleshakingofthebuildingwokeupallthepeoplewhowereasleep.

　　先行词不是allthepeople吗?有个all来修饰了怎么还用who引导不用that啊?