问题
The light is still on in his room. Do you know ?— Maybe he has to study for a test.
A:if he works hard
B:who he is studying with
C:what he is busy with
D:when he will stop working
B:who he is studying with
C:what he is busy with
D:when he will stop working
正确答案是：
同类题型
_______did it _______ the conductor to check the tickets this morning? — Half an hour.
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