All of the plants now farmed on a large scale were developed from plants ______ wild.

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问题 All of the plants now farmed on a large scale were developed from plants ______ wild.

选项 A、that once grew
B、once they grew
C、they once grew
D、once grew

答案A

解析 介词后通常跟名词或名词性词组,由题干中的介词from可断定其后不能接完整句子,故排除B、C。that引导限制性定语从句,修饰plants,A为正确答案。先行词plants在定语从句中作主语,关系代词不可省略,所以D缺少关系代词,不能选。
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