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请问:一个英语句子She is as plain as her mother is beautiful.这是我四级书上的

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请问:一个英语句子
She is as plain as her mother is beautiful.这是我四级书上的一个选择,选的是plain 此处当“难看”讲。可是我不明白这个句子怎么有两个“is”???
请问:一个英语句子She is as plain as her mother is beautiful.这是我四级书上的
这句的意思是,她很难看,而她的妈妈很漂亮。
as的一个用法:不同项目比较,后面的as 分句必须用完整模式。
这里有三个例句:
She is as beautiful as her mother (is). (两者比较项目相同,后面用省略模式。)
She is as plain as her mother is beautiful. (两者比较项目不同,用完整模式。)
She is as brilliant as she is beautiful. 她又聪明又漂亮。(不同项目,用完整句子。)
所以根据第二种情况,后者的比较,就是她妈妈漂亮必须是完整句,也要用is。