in hospital they wake patients up at 6,_____ is much too early ,选when 还是which

来源:百度知道 编辑:UC知道 时间:2024/04/30 18:52:02
请告知原因

which
注意:这是个非限制性定语从句,此处先行词是6点,在从句中作为主语
所以只能用which.
如果稍微改下题目 in hospital they wake patients up at 6,_____ it is much too early . 此时此处填when, 因为把先行词带入从句中 it is much too early at 6. at 6 是时间状语 就应该用when

which
关系代词作从句主语
不能用when,关系副词,副词不能做主语

which