You __________ buy a gift, but you can if you want to.


  1. A.
    must
  2. B.
    mustn’t
  3. C.
    have to
  4. D.
    don’t have to
D
試題分析：考查情態(tài)動詞：A. must必須，B. mustn’t禁止，C. have to不得不，D. don’t have to不必，句意：你不必買一個禮物，但是如果你想要買也可以。選D。
考點：考查情態(tài)動詞用法
點評：情態(tài)動詞的用法比較復(fù)雜。突出的是表示推測：如果是對現(xiàn)在的情況進行推測，使用“情態(tài)動詞+動詞原形”；對過去的情況進行推測，使用“情態(tài)動詞+have done”；情態(tài)動詞也經(jīng)常用于虛擬語氣，要分具體情況來分析，在條件句中和賓語從句，表語從句中都有體現(xiàn)。
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