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單項選擇題

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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I earn dollars（）hour as（）supermarket cashier on Saturdays.

A.a;an
B.the;a
C.an;a
D.an;the