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:

很明顯答語在結構上缺少主語。To do 與-ing都可充當主語，但 to do充當主語多表示某一具體的動作，且多表將來。故選B。