---When _____ your mother _____ you that blue dress, Lucy?
---Sorry, I really can’t remember. Maybe two or three weeks ago.
A. will;buy B. did;buy C. does;buy D. is;buy
【答案】B
【解析】句意: 路西，你妈妈什么时候给你买的那条蓝裙子？对不起，我真记不起来了，可能是两三周前。根据Maybe two or three weeks ago.可能是两三周前，可知是一般过去时态，助动词用did，动词恢复原形，故答案选B.