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    17、Why don’t you call directory enquiries and ask them? It ________ a new number if it’s not in the book.

    A. can be               B. could be                   C. must have been              D. must be

    17、D

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

    A. can be               B. could be                   C. must have been              D. must be

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