英语定语从句：All of the flowers now raised here have developed fro

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英语定语从句：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
为什么选c?为什么说省略了宾语which?

1 once 这里是副词,一般放在行为动词前,助动词后如 Tom has once broken his leg.
2 those是先行词做后面定语从句的修饰对象,而which在定语从句中是关系代词省略,是定语从句中主语they（花的种植者）的受动对象.those引导定语从句时有关系词省略的情况

英语定语从句：All of the flowers now raised here have developed fro 定语从句问题2. All of the flowers now raised here have developed f All of the flowers now raised here have developed from those 8. All of the flowers now raised here have developed from th 14.All of the flowers now raised here have developed from th The flowers now raised here have developed from those ___in All of the flower now raised here developed from those____in All of the flower now raised here developed from those_that All of the flowers now _____ here have developed from those 详解All of the flowers now _____ here have developed from thos All of the plants now raised on farms have been developed fr 1.All of the plants now raised on farms have been developed