选择until还是unless
问题描述：
选择until还是unless
Don't get off the bus ( ) it stops.
A.until B.unless
我个人觉得两者都对都对.为什么答案是A
答
until表"直到",强调时间的延续,引导时间状语从句;unless表"除非",强调条件,引导条件状语从句.看下面这两个例句：1. I didn't know the news until my teacher told it to me. 2. I couldn't know the news unless my...