—Henry doesn’t seem like the same person.—so much in the war has made him more thoughtful.

—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

A. For him to see(答案→)B. His seeingC. Having seenD. To be seeing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。

我也是这个答案

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