题目内容

— The light in his room is still on. Do you know _________?
— To prepare for the coming exam, I think.
A．if he works hardB．why he stays up so late
C．why is he so busyD．when he will stop working
B

试题分析：根据后文回答，我认为在为即将到来的考试做准备，可知上文在问你知道为什么他熬夜那么晚吗？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。但是从句是客观真理，一般用一般现在时态。AD连接词不正确，C语序不正确，根据句意，故选B。
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