中国石油大学 / 中石油
正确率:100%
24. 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
A、wouldn’t be
B、will not have been
C、wouldn’t have been
D、would have not been
参考答案: