问题
The light is still on in his room. Do you know —— In order to practise for the English singing contest.
A:if he works hard
B:who he is studying with
C:why he is so busy
D:when he will stop working;
B:who he is studying with
C:why he is so busy
D:when he will stop working;
正确答案是：
同类题型
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