-The light in his room is still on.Do you know______?-In ord

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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.

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