此句Farmers are producing harvests twice as large as before中的twice as large as before是harvests 的定语从句吗?

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此句Farmers are producing harvests twice as large as before中的twice as large as before
是harvests 的定语从句吗?

不是.如果后面跟的是which或引出的which/that are twice as large as before,那就是从句.要记住,既然是从句,句中就需有主语和谓语.twice as large as before中两者皆缺,可算作定语从句中省略了主谓语之后的形容词短语,功用相同.