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All of the flowers now raised here have developed from those _______ in the forest.

A. once they grew  B. they grew once   C. they once grew      D. once grew

选 C。


解析:

先行词是 those,可视为 those flowers 之省略。they once grew 前省略了关系代词 which。全句意为:这儿所养的花是由他们曾在森林里种植的花培养出来的。

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