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Verbal·Standard English Conventions·Form, Structure, and Sense
hard
Albania, Hungary, and the other member nations of the North Atlantic Treaty Organization, or NATO, share a commitment to the principle of collective defense, each NATO member        to defend the others if necessary.
Which choice completes the text so that it conforms to the conventions of Standard English?
A
has pledged
B
pledges
C
is pledging
D
pledging