The ground is wet ,so it must have rained last night,( A hasn‘t it B didn’t it C mustn‘t it D doesn’t it

问题描述:

The ground is wet ,so it must have rained last night,(
A hasn‘t it B didn’t it C mustn‘t it D doesn’t it

此处由于有明显的时间点,应当用didn't it?

虚拟语气,选B