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

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In the 1960s, Greece, Malta, and dozens of other countries were allocated unique country dialing codes to route international calls. Most of the original two or three-digit codes        by the International Telegraph and Telephone Consultative Committee later changed in response to geopolitical circumstances or telecommunications needs.

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

A

were assigned

B

had been assigned

C

assigned

D

would be assigned