|Question 20Verbal

Source Texts

Text
The Greek dramatist Euripides's Cyclops, a satyr play, is an extant work: it can still be read. By contrast, lost works like Euripides's play about the hero Alcmaeon, Alcmaeon in Psophis—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?
have become
A
becomes
B
has become
C
is becoming
D