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--Who it be that is knocking at the door? --It be Father, but I’m not sure. A. c

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--Who it be that is knocking at the door? --It be Father, but I’m not sure. A. c

--Who______ it be that is knocking at the door?  

--It ______ be Father, but I’m not sure.

   A. can; must              B. can; may        C. must; can           D. may; must

试题答案

B