

Mọi người ơi cho mình hỏi câu này khoanh B đúng không ạ?
'' It ......, so they have to cancel the horse race today.
A. rains B. is raining C. rained D. are raining
'' It ......, so they have to cancel the horse race today.
A. rains B. is raining C. rained D. are raining