题目

 I didn’t see your sister at the meeting. If she _____, she would have met my brother. A. has come                B. did come                C. came                       D. had come 答案：D某种数码产品原价每只400元，经过连续两次降价后，现在每只售价为256元，则平均每次降价的百分率为（ ）A. 20% B. 80% C. 180% D. 20%或180%