having read是什么时态

　　Having read Page 1, he turned over to page 2.

　　他读完第一页后，就翻到第二页。

　　I remember having read about it in some magazine.

　　我记得看到哪本杂志谈到这件事。

　　Having read this article, you've seen almost the entire scope of JAXP.

　　阅读完本文后，您差不多已经了解到JAXP的全部范围

　　Having read the book twice, he decided to write a book report about it.

　　把书读了两遍之后，他决定写一篇读书报告。