—Thelightinhisofficeisstillon.Doyouknow

問題詳情：

—The light in his office is still on. Do you know _____________?

               —In order to prepare for the coming exams.

               A. if he works hard                                           

               B. when he will stop working

               C. why is he so busy    

               D. why he stays up so late

【回答】

D

知識點：賓語從句

題型：選擇題