He usually goes to work by bike____it rains.为撒是except when不可以是expect that表事实呢
问题描述：
He usually goes to work by bike____it rains.为撒是except when不可以是expect that表事实呢
答
表示那个时候是下雨 that的话 无意义
答
逻辑上,下雨的时候就不骑了.强调是时间这个概念,在这个时间里做什么.