they came here an hour ago 改为同义句 they ___ ___ here for an hourthe dog died two weeks ago 改为同义句the dog ___ ___ ___ since two weeks ___
问题描述：
they came here an hour ago 改为同义句 they ___ ___ here for an hour
the dog died two weeks ago
改为同义句
the dog ___ ___ ___ since two weeks ___
答
have been
has been dead ,ago