If you him yesterday, you what to do now.
A. asked … would know
B. had asked … would have known
C. asked him … know
D. had asked … would know
网友回答
A. asked … would know
B. had asked … would have known
C. asked him … know
(答案→)D. had asked … would know
解析：本题考查虚拟语气。从句与过去事实相反用had done，主句与现在事实相反用would do。句意：如果你昨天问他，你现在就会知道发生了什么。