________my bike was broken, ________ I went to school by bus yesterday.
A：Because; /
B：Because; so
C：Although; but
D：Although; /
已知△ABC的有两个角都是50°，则它的第三个角是（ ）
三角形三边长分别是6，2a﹣2，8，则a的取值范围是（ ）
