C80 The leak of question paper

When Carl Black came back, he saw Rosaline Moore standing in front of his cabin. Surprised, he frowned and asked, "Professor Moore, is everything alright?"

She smiled and said, "Oh yes, everything is fine." Taking out the key from her purse, she passed it to him and explained "I think you dropped it in the canteen and I thought it was mine, so I picked it up. But mine was in my office