问题
选择题
-When _______ your mother _______ you that blue dress, Mary?
-Sorry, I really can't remember.
A．does; buy
B．has; bought
C．had; bought
D．did; buy
答案
答案：D
题目分析：句意：Mary，你妈妈什么时候给你买的那条蓝色裙子？对不起，我真的记不得了。买裙子这件事情发生在过去，要用一般过去时。故选D。