The game will have to be put off if it ( ) raining by 3 o'clock this afternoon

The game will have to be put off if it ( ) raining by 3 o'clock this afternoon
A won't stop B hasn't stop C isn't stop D didn't stop
正确答案是B ,解析是 条件状语从句不用将来时故排除A 根据从句中提供的时间状语可知,此处表示将来时已经完成的动作,故用现在完成时表示将来时、