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Sorry, I_____. I have a piano lesson. A. can’t B. couldn’t C. mustn’t D. can ( )6. — Could I invite my friends to a party? — Yes, of course you_____. A. can B. could C. must D. may A 單元語法專練 A ( )7. I’m busy these days. I_____get up at 5:00 in the morning. A. can B. might C. have to D. may ( )8. — What’s today? — _____