一、选择填空题 在下面每小题所给的四个答案中有一个能够完成本题的正确答案，请把其代号填入左边括号内：（15分）()1. It _ sunny today, but it _ cloudy yesterday.A. is, isB. was, wasC. is, wasD. was, is()2. I _ at school now, but I _ at home an hour ago.A. am, amB. was, wasC. am, wereD. am, was()3. - _ there any students in the classroom? - No, there arent. But there _ some half an hour ago.A. Are, wereB. were, areC. are, areD. were, were
