— Were you surprised by the ending of the film?

— No, I ______ the book, so I already knew the story.

A．was reading

B．had read

C．am reading

D．have read

平面环形交叉口设计除了中心岛的半径应满足设计车速的要求外，还应满足( )。

A．相交道路的夹角不得小于60°

B．机动车道必须与非机动车道隔离

C．转角半径必须大于20m

D．满足车辆进出交叉口在环道上的交织距离要求