可以這樣改.that還可以換成which.即：
The documents that/which they were searching for have been recovered.
但是,原句“The documentsfor which they were searching have been recovered”中的which就不能換成that了,因為它緊跟在介詞for的后面.
如果把for which they were searching這個定語從句還原成獨立的句子,就是：
They were searching for the documents.
search for 尋找
The documentsfor which they were searching have been recovered.能不能換成The documents that they were searching for have been
The documentsfor which they were searching have been recovered.能不能換成The documents that they were searching for have been recovered.
英語人氣：744 ℃時間：2020-04-28 20:12:32
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