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The city of Council Bluffs in southwestern Iowa – - – name from the fact that American explorers Lewis and Clark passed through the area in 1804, holding a council with the Indians of the area.

(1) derived it
(2) has been derived
(3) derives its
(4) is deriving

Source:http://sabrd.alc.co.jp/toefl/grammar/index.html
wakuover 3 years ago
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