had no idea：即为didn't know，后面可加疑问代词引导的结构。
Chapter Twenty-Two I Am No Longer Poor After St. John left me,it began to snow. It snowed all night and the next day. In the evening,I was sitting by the fire and had just begun to read when I heard a knock at the door. St. John came inside the house,covered in snow. "It something wrong?"I asked. "No one should be outside in this terrible weather." "There's nothing wrong,"he answered calmly. "I just came to talk to you. Besides,I'd like to hear the rest of your story." He sat down. I had no idea what he meant. I wondered if this was connected to his strange actions with the piece of paper on my table. But he looked normal,and we talked of ordinary things for a while. However,he always seemed to be thinking of something else.