Question

The rain 　　　 for two days and the roads were flooded.

A.kept up　　　　　B.kept on　　　　C.kept down　　　D.kept up with

Answer 1

A

解析:

题意是：雨持续下了两天，道路被洪水淹没了。表示“持续”可以用keep on,也可以用keep up,所不同的是keep on总是与doing sth.连用，而keep up则与名词连用或单独使用，据此本题的正确答案应是keep up。