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單項選擇題

I regret（）that I'm unable to help you.

A.saying
B.to say
C.say
D.said

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單項選擇題

（）every day for 20 minutes.

A.Exercise
B.To exercise
C.Should exercise
D.Exercising

單項選擇題

I tried（）the book in a few days, but actually I couldn't, just because of too much work for me.

A.finish
B.finishing
C.to have finished
D.finished

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