单选题 If Mr. Dewey __________ present, he would have offered any possible assistance to the people there.
【正确答案】 B
【答案解析】【解析】考查虚拟语气。根据主语的谓语动词形式可知题干表示与过去的事实相反,从句谓语动词用had+过去分词,故选B。