has anyone ever been lost here before 这是过去完成时么?
问题描述：
has anyone ever been lost here before 这是过去完成时么?
答
现在完成时，虽然有before
答
不是。 had ... been 才是
答
不是过去完成时.因为是has不是had.
是现在完成时的被动语态.