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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1838

—How often do I need to feed the fish?
-They _______ food every day, or they will be hungry.

A.must give B.mustn’t give C.mustn’t be give. D.must be given
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—HowoftendoIneedtofeedthefish?