—Henry doesn’t seem to be what he was.—No. so many terrible things in the war has made hi

问题补充：

—Henry doesn’t seem to be what he was.

—No. so many terrible things in the war has made him more thoughtful.

A. Seen

B. His having seen

C. Having seen

D. To have seen

答案：

A. Seen

(答案→)B. His having seen

C. Having seen

D. To have seen

解析：句子的谓语是has made，“看到战争中如此多可怕的事”是说明已发生的事实，对现在有影响，故应用动名词的完成式作主语。