题目

I got Ann's phone number _______asking her aunt, so I could call her last weekend. A . with B . by C . from D . at 答案：B已知，4个矿泉水瓶可换矿泉水一瓶，现有15个矿泉水瓶，若不加钱，最多可以换几瓶矿泉水？