题目内容

---Don’t litter the ground, boy! Look at the sign: Rubbish ______ into the dustbin.

---Sorry.


  1. A.
    has throw
  2. B.
    was throw
  3. C.
    must throw
  4. D.
    must be thrown
D
此句考查的是含有情态动词的被动语态,故选D。
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