While having orbited the sun, the satellite has sent more than four billion bits of information back to earth.

A．orbiting

B．to orbit

C．being orbited

D．having been orbited

混合痔是指（）

A.环形内痔

B.痔与肛瘘同时存在

C.痔与肛旁脓肿同时存在

D.内痔、外痔在不同位置同时存在

E.齿线附近由痔内静脉与痔外静脉丛之间彼此吻合相通形成