Bob used to _______ a difficult person to get along with. But recently he has got used to
_______ with others in a friendly way.
A:be, work
B:be, working
C:being, work
D:being, working
下列国家的法律文献,在世界近代史上最早实现“把权力关进制度的笼子里”的是( )
在正方形、矩形、菱形、平行四边形、等腰梯形中,其中中心对称图形的个数是( )