第15题: [单项选择]______ at the price list, he'd have known what to expect. A. Had Mr. Robinson looked B. If Mr. Robinson looked C. If Robinson would have looked D. Had Mr. Robinson been looking 参考答案:A 答案解析:虚拟语气题。在表示与过去事实相反的虚拟条件句中,从句常用过去完成体形式,而主句则用 would/could/might 等情态动词加上 have done 的形式。如果 if 省略,则可将if从句中的