题目

下列地点中，位于“北半球”“中纬度”“西半球”的是（  ） A、30°W, 40°N           B、15°W, 40°N  C、30°W ,29 °N          D、170°W, 40°S 答案：A －We haven't been to the Great Wall in Beijing for ages． －No, I don't remember ________ I last visited it． [　　] A．when was it that B．when it was that C．it was when that D．when it was