问一道英文题目~18Fort cenion was the site of what (was) the principal fur-teading post on the appear Missouri River.为什么括号里不用being?

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问一道英文题目~18Fortcenionwasthesiteofwhat(was)theprincipalfur-teadingpostontheappearMissouriRiver.为什么括号里不

问一道英文题目~18Fort cenion was the site of what (was) the principal fur-teading post on the appear Missouri River.为什么括号里不用being?
问一道英文题目~18
Fort cenion was the site of what (was) the principal fur-teading post on the appear Missouri River.
为什么括号里不用being?

问一道英文题目~18Fort cenion was the site of what (was) the principal fur-teading post on the appear Missouri River.为什么括号里不用being?
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