题目

 __________him not to do so, he wouldn’t have made such a serious mistake. A. Did I persuade         B. If I persuade        C. If I should persuade     D. Had I persuaded 答案：D如图，一个密封的长方体水箱，从里面量长80厘米，宽30厘米，高30厘米，当水箱如图1放置时，水深为20厘米，如果把水箱如图2放置，水深(　　)厘米．