题目：
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
答案：
答案：D
题目分析：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。
点评：本题较难。错综虚拟对于学生来说是难点，虚拟语气是高中阶段的重要语法项目，需要考生牢记各种情况的虚拟语气的谓语动词的形式，并要有分析理解语境的能力。
即学即练：If you _______to the teacher carefully yesterday, you _______ how to do the exercise now.
A．listened; would know
B．had listened; would be knowing
C．listened; would have known
D．had listened; would know
解析：D。句意：如果你昨天认真听了老师的讲话，你现在就知道如何做这道题了。
