问题补充：
—The lights in the classroom are still on. Do you know.
—To revise for the coming exams.
A. what they stay up late for
B. why they stay out late
C. when will they stop studying
D. how they work on their lessons
答案：
(答案→)A. what they stay up late for
B. why they stay out late
C. when will they stop studying
D. how they work on their lessons
解析：
试题分析: 句意：教室的灯还亮着，你知道他们熬夜做什么吗。为即将到来的考试复习呢。what they stay up late for他们熬夜做什么，why they stay out late为什么很晚不回家，when will they stop studying什么时候将停下学 习，how they work on their lessons他们怎么学习功课。根据To revise for the coming exams，可知答案选A。
