问题
选择题
.I didn’t see Mr White at the meeting ._____ he come, he would have given a lecture.
A．Would
B．Did
C．Should
D．Had
答案
D
根据语境可知, 后一句是一个表示与过去事实相反的假设。if条件从句用过去完成时had done主句用would have+ 过去分词, 又知if条件句中如有were, should, had，可以省去if，并使用倒装语序, 即were, should, had+主语+谓语动词。故答案为D。