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At first, I thought it ________ ________ the wind. 三、 用方框中所給詞填空。 may not B. must。 mustn’ t ( )2. — Shall I get one more cake for you, Dad? — Thanks, but you , I’ ve had enough. A. may not B. must not C. can’ t D. needn’ t ( )3. Even the top students in our clas