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    19、 Why don’t you call directory enquiries and ask them? It _____ a new number, for it’s not in the book.                                                         

    A. can be                                                         B. must be                   

    C. can have been                                              D. must have been

    19、B

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     Why don’t you call directory enquiries and ask them? It _____ a new number, for it’s not in the book.                                                         

    A. can be                                                         B. must be                   

    C. can have been                                              D. must have been

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