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-----HowoftendoIneedtowaterthehorses?      -----They

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問題詳情:

-----HowoftendoIneedtowaterthehorses?      -----They

-----How often do I need to water the horses?

       -----They ________ water every day, or they will be thirsty.

      A. must give               B. mustn’t give

      C. must be given            D. mustn’t be given

【回答】

C

知識點:情態動詞

題型:選擇題

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