摘要: 在学校我们必须穿校服:We have to wear uniforms at school. 句型:不得不/必须做某事:have to do sth 否定:不必做某事:don’t have to do sth 穿校服:单数:wear a uniform 复数:wear uniforms 练:(1) – I can’t stop smoking, doctor. – For your health, I’m afraid you . A. can B. may C. must D. have to

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