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Verbal·Standard English Conventions·Boundaries
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A number of scientific phenomena have been named after nineteenth-century Czech physiologist Jan Evangelista Purkinje, including the Purkinje effect, which __________ the eye’s tendency to perceive objects as blue tinted in low-light conditions.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
has been
B
will have been
C
was
D
is