— 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 |
— 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 |