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單項選擇題

We（）every day when we were children.

A.used to swim
B.used to swimming
C.use to swim
D.use to swimming

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單項選擇題

We must make a difference between（）language and（）language.

A.spoken；written
B.speaking；written
C.speaking；writing
D.speak；write

單項選擇題

What a fool I have been! Why（）I think of that before?

A.don’t
B.didn’t
C.not
D.do