-----HowoftendoIneedtowaterthehorses? -----They
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問題詳情:
-----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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