-The light in his room is still on.Do you know______?-In order to prepare for the coming exam.A.if he works hardB.why he stays up so lateC.why is he so busy d.when he will stop working

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-The light in his 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 so late
C.why is he so busy
d.when he will stop working

选B,
解析:
in order to是“为了……”的意思,表示目的、原因,
the light is still on 是指灯还开着,说明已经很晚了.