All of the plants now raised on farms have been developed from plants ______ in

游客2025-03-26 10

问题 All of the plants now raised on farms have been developed from plants ______ in the wild.

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

答案 B

解析本题测试定语从句的用法。本句中所缺成分应是限定plants一词的，that代替前面的先行词plants，在从句中做主语，故不能省略，答案只能是B。

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