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Verbal·Standard English Conventions·Form, Structure, and Sense

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The Roman poet Lucan’s Pharsalia, an epic poem about Julius Caesar, is an extant work: it can still be read. By contrast, lost works like Lucan’s poem praising Emperor Nero, Laudes Neronis—no copy of which exists—__________ known to antiquarians only through references in extant works.

Which choice completes the text so that it conforms to the conventions of Standard English?

A

have become

B

is becoming

C

has become

D

becomes