这里的关系副词能都用介词加which替换
问题描述：
这里的关系副词能都用介词加which替换
She came at a time when we needed he r most
答
保证准确!She came at a time when we needed her most.= She came at a time (at which) we needed her most.在我们最需要她的时刻.她来了.at which = at the time,在后面的定语从句中充当时间状语.如果对你有所帮...