题目内容：

It is time句型
It is time the dog ____________ how to behave properly.
A.is learning B.learns C.learned D.to learn
如上,答案给的是D,可我觉得应该选C.请高手看看这道题是否是答案错误.

优质解答

就是C
你的判断正确
虚拟语气
如果说It is time for the dog ____________ how to behave properly.多了一个for 那么选D