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單項(xiàng)選擇題

You must explain（）how they succeeded（）the experiment.

A.of us；for
B.at us；at
C.to us；in
D.for us；to

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單項(xiàng)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

單項(xiàng)選擇題

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

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