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

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

admin2009-01-13  47
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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