题目

（2010·江苏南京金陵中学高三10月月考）28. Canada has vast areas of wildness, from the Arctic north,  ______        average winter temperatures are usually minus 20 degrees centigrade, to the 8892 – kilometer – long border _______the USA in the south A. where; with       B. which; /     C. where; /     D. which; with 答案：A— How long ______ in Shanghai? — For two weeks. I'm going to visit some schools in Shanghai. [      ]A. did you stay B. are you staying C. do you stay D. have you stayed