公元12、13世纪时兴起的蒙古民族结束了（）而永久居住在这个地方。
参考答案：北方民族聚散无常的局面
I have _______ much work to do _______ I have no time to go out with you. [ ]
A. such; that
B. so; that
C. so; as
D. such; as
压缩比与90号、93号、97号汽油
