–When _______ your mother _______ you that blue dress, Lucy?
–Sorry, I really can’t remember. Maybe two or three weeks ago.
A. will; buy B. does; buy C. did; buy
–When _______ your mother _______ you that blue dress, Lucy?
–Sorry, I really can’t remember. Maybe two or three weeks ago.
A. will; buy B. does; buy C. did; buy
C
解析:考查实义动词的时态。由答语two or three weeks ago,可知买裙子发生在过去,用一般过去时。“露西,你妈妈什么时候给你买的蓝裙子?”buy是一个实义动词,在过去时中,一般疑问句时需要借助助动词did。故选C。