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

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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