Kate ______the letter before her mother came into her moon.为什么填had written

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Kate ______the letter before her mother came into her moon.为什么填had written

Kate ______the letter before her mother came into her moon.为什么填had written
Kate ______the letter before her mother came into her moon.为什么填had written

Kate ______the letter before her mother came into her moon.为什么填had written
这里有一个before,而且还有一个came,也就是说妈妈过去进去了她的房间,但她写信还在这之前,过去的过去就用过去完成时had done了.
祝学习愉快!

过去完成时态,had+过去分词
现在完成时态,have/has+过去分词
初三会学到的!