Question

 —Henry doesn’t seem like the same person.

       —       so much in the war has made him more thoughtful.

   A. For him to see        B. His seeing             C. Having seen          D. To be seeing

Answer 1

B

解析:

很明显答语在结构上缺少主语。To do 与-ing都可充当主语，但 to do充当主语多表示某一具体的动作，且多表将来。故选B。