孝文帝推行的土地制度是（ ）
A：分封制
B：均田制
C：屯田制
D：更名田
在各种色光中，被成为三原色光的是（ ）
He said he was very sorry because it was _______ his power to make the final decision. _______, I had to turn to others for help.
、 
的关系是（ ） 
