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    12、The two experts worked at the task of writing a preface to the new dictionary for three hours             .

           A．at length              B．in full                  C．on end                D．in time

    12、C

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    The two experts worked at the task of writing a preface to the new dictionary for three hours             .

           A．at length              B．in full                  C．on end                D．in time

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