单选题How very delightful ___&n

问题补充：

单选题Howverydelightful___tosuggestthis!A.it is youB.it was for youC.it is of youD.it was you

答案：

C解析这是感叹句,it为形式主语, of you to 为不定式的复合结构做真正的主语,因为 delightful是you的逻辑上的表语,所以不用介词for而用of引起这不定式复合结构.