【题目】Linda couldn’t have broken into the teacher’s office at midnight, for it was only nine o’clock ______she returned to the dormitory and had a sound sleep.
A. before B. when
C. that D. until
在线课程【答案】B
【解析】
考查时间状语从句。句意：Linda不可能半夜闯进老师的办公室，因为她回到宿舍睡了个好觉才九点。结合句意可知此处是when引导的时间状语从句，故选B。