单项选择题
My aunt（）me for a long time when I met her yesterday.
A．didn't see B．hadn't seen C．hasn't seen D．doesn't
单项选择题 Tom puts up his hand（）the teacher asks a question.
单项选择题 （）you have to do is more practice.
单项选择题 If you had asked him for help, he（）you some.
