问题
选择题
—The light in his office is still on. Do you know ?
—In order to prepare for tomorrow’s meeting.
A．if he works hard
B．why he stays up so late
C．that he is so busy
D．when he will stop working
答案
答案：B
题目分析：句意：他的办公室的灯仍然亮着。你知道他为什么熬夜那么晚吗？为了准备明天的会议。宾语从句的结构：主语+谓语+连接词+从句。从句在句中作宾语。从句要用陈述句的语序。如果主句是一般现在时，从句根据需要选择时态，如果主句是过去时态，从句要用相应的过去时态。根据回答，可知上文在问熬夜的原因，故选B。