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單項選擇題

I forgot to return the book to you yesterday. So I（）today.

A.might do it
B.must do it
C.had to do it
D.must have to do it

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I fell and hurt myself while I（）basketball yesterday.

A.was playing
B.am playing
C.play
D.played

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I failed the maths exam again.（）

A.Well done.
B.What a pity!
C.That's right
D.I'm glad.

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