If you yesterday，you with your mother now.
A. set off; would talk
B. had set off; would be talking
C. set off; would have talked
D. had set off; would talk
网友回答
A. set off; would talk
B. had set off; would be talking
C. set off; would have talked
(答案→)D. had set off; would talk
解析：句意：如果昨天你动身走了，那么你现在就能和你的妈妈说话了。这是错综虚拟语气，从句是对过去的虚拟，所以用过去完成时，主句是对现在的虚拟，所以用would+动词原形。