had done 是过去完成时,have done是现在完成时,那have been和had been呢?be不是动词呀?急急急急
问题描述:
had done 是过去完成时,have done是现在完成时,那have been和had been呢?be不是动词呀?
急急急急
答
had done 是过去完成时,have done是现在完成时,那have been和had been呢?be不是动词呀?
急急急急