him to do like this he wouldn’t have made such a serious mistake in his writing.A. Did y

问题补充：

him to do like this, he wouldn’t have made such a serious mistake in his

writing.

A. Did you persuade

B. Had you persuaded

C. If you should persuade

D. If you persuade

答案：

A. Did you persuade

(答案→)B. Had you persuaded

C. If you should persuade

D. If you persuade

解析：考查虚拟语气及倒装。此题表示的是与过去事实相反的虚拟语气，结构为if +主语+had done,主语+would/could/might have done 结构，省略if，had 前提，故选B。句意：如果你说服了他这样做的话，他就不会犯如此严重的错误了。