----The light in the room is still on. Do you know_______? ----In order to prepare for the coming exam.
A．if he works hard
B．why he stays up late
C．why is he so busy
D．when he will stop working
答案：B
试题分析：句意：——房间里的灯还亮着。你知道他为什么熬夜吗？——为了准备即将到来的考试。A. if he works hard 他是否学习努力；B. why he stays up late 他为什么熬夜； C. why is he so busy为什么他这么忙；D. when he will stop working他将何时停止学习。根据In order to prepare for the coming exam.可知此处询问他熬夜的目的和原因，故选B。 考点：考查宾语从句的用法。