填入适当的并列连词使之成为并列句I'll stay here ____ my mother comes back.
问题描述：
填入适当的并列连词使之成为并列句I'll stay here ____ my mother comes back.
答
I'll stay here _before_ my mother comes back.
before 并列连词 以前
我妈妈回来以前,我将呆在这儿.