|Question 17Verbal

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Text
The Hereford map is a mappa mundi from the fourteenth century. Currently held at Hereford Cathedral in Hereford, England, it is one of over 1,000 such world maps from the European Middle Ages still remaining, with the even older Theodulf of Orleans map from the eleventh century (now held at the Vatican Library in Vatican City) ____ another one.
Which choice completes the text so that it conforms to the conventions of Standard English?
is
A
has been
B
being
C
was
D