-The light in his room is still on.Do you know______? -In order to prepare for the coming exam.
A.ifheworkshardB.whyhestaysupsolateC.whyishesobusyd.whenhewillstopworking...
A.if he works hard
B.why he stays up so late
C.why is he so busy
d.when he will stop working 展开
B.why he stays up so late
C.why is he so busy
d.when he will stop working 展开
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