24.(2.5分) If the United States had built more homes for poor people in 1955,the housing problems now in some parts of this country _____ so serious.
A、wouldn’t be
B、will not have been
C、wouldn’t have been
D、would have not been
(责任编辑:admin)要这答案加QQ:800020900 或加微信:vq800020900 获取