----You look sad. What`s wrong with you? -----I bought bicycle, but when I rode it, one of wheels became flat. A. a; the B. 不填; the C. a; 不填 D. the; a 查看更多

 

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----You look sad. What`s wrong with you?
   -----I bought ______ bicycle, but when I rode it, one of ______ wheels became flat.
A. a; the            B. 不填; the        C. a; 不填    D. the; a

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