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Verbal·Standard English Conventions·Boundaries
hard
Many works of the Roman engineer Frontinus (1st century CE) are        his De aquaeductu, a report on the Roman aqueduct system, is an extant work: it can still be read.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
lost, and conversely
B
lost. Conversely,
C
lost and conversely,
D
lost, conversely,