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    ---______.
    ---Sorry, I don’t know．


    1. A.
      Have you seen Mr．Smith?
    2. B.
      Where has Mr．Smith gone?
    3. C.
      How about Mr．Smith?
    4. D.
      Hello, Mr．Smith．
    B
    情景对话题。A．Have you seen Mr．Smith? 你见过史密斯先生吗？          B．Where has Mr．Smith gone?史密斯先生先生去哪了C．How about Mr．Smith? 史密斯先生怎么样        D．Hello, Mr．Smith． 喂，史密斯先生
    句意：斯密斯先生去哪了？对不起，不知道。 根据语境选B
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