As you see , the number of cars on our roads rising these days.
A. was keeping
B. keep
C. keeps
D. were keeping
网友回答
A. was keeping
B. keep
(答案→)C. keeps
D. were keeping
解析： 考查时态，the number of+名词做主语时，意为什么的数量，谓语动词应用单数形式，根据句意正如你看到的那样我们的公路上汽车的数量这些天一直在增加。数量在增加指的是现阶段的状态，应用一般现在时态，所以选C。