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题目
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

提问时间:2020-10-21

答案
选 C.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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