--People should stop using their cars and start using public transport. . The roads are

问题补充：

--People should stop using their cars and start using public transport.

-- . The roads are too crowded as it is.

A. All right

B. Exactly

C. Go ahead

D. Fine

答案：

A. All right

(答案→)B. Exactly

C. Go ahead

D. Fine

解析：交际用语. A.好的 B. 完全正确;C.继续 D.很好.句意,人们应该停止用私家车,开始使用公共交通工具.完全正确.事实上公路太拥挤了.选B,最符合语境.