30. A:How did the accident happen? accident 事故B:I don’t know. ______ the car hit the train, I ____
問題詳情
30. A:How did the accident happen? accident 事故B:I don’t know. ______ the car hit the train, I ______. (A) After; wasn’t sleeping (B) Before; didn’t sleep (C) When; was sleeping (D) When; am sleeping