专四

单选题_________填上最佳答案。

A．this 
B．that
C．/ 
D．what

参考答案：B进入在线模考
这句话需要一个关系代词连接定语从句修饰名词plants，同时该关系代词在从句中充当主语成分，只有选项B符合要求，而且that不可省略。
【点睛】语法线索题。考查关系代词的用法this能作限定词或代词，但不作关系代词，不可以连接从句。what相当于that which／the thing that，其本身已包括了先行词．因此作关系代词时只能引导如主语从句、宾语从句等名词性关系分句，而不能引导定语从句等形容词性关系分句。

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A．into 
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