问题
The light in his room is still on. Do you know _________?— To prepare for the coming exam, I think.
A:if he works hard
B:why he stays up so late
C:why is he so busy
D:when he will stop working
B:why he stays up so late
C:why is he so busy
D:when he will stop working
正确答案是:
同类题型
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