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

easy

Sometimes, when a dog sniffs the ground, it will open its mouth, curl back its top lip, and expose its teeth. The dog __________ this behavior, called the flehmen response, to transmit scents to powerful receptors just above the roof of the dog’s mouth.

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

A

to use

B

uses

C

using

D

having used