单项选择题
We（）every day when we were children.
A.used to swim B.used to swimming C.use to swim D.use to swimming
单项选择题 We must make a difference between（）language and（）language.
单项选择题 What a fool I have been! Why（）I think of that before?
单项选择题 ---Which do you like better, real movies（）cartoons? -- I prefer cartoons （）real movies.
