【单选题】All of the plants now raised on farms have been developed from plants ______ in the wild.
A.once they grew
B.that once grew
C.they grew once
D.once grew
网考网参考答案:B
网考网解析:
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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