问题
The light in his office is still on. Do you know _______—To prepare for the material(材料) the meeting will need tomorrow, 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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