— Have you heard of Loulan?

— Of course. It is believed _____ many years ago. [      ]

A. that it covered over by sandstorms

B. that it is covered over by sandstorms

C. to be covered over by sandstorms

D. to have been covered over by sandstorms

骶耻外径可间接判断（）

A.骨盆入口平面前后径

B.骨盆入口平面横径

C.中骨盆平面前后径

D.中骨盆平面横径

E.出口平面横径