题目

—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：B 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。19．下列醇中，能在铜作催化剂条件下发生氧化反应但得到的物质不是醛的是（　　）A．CH3OHB．（CH3）2CHOHC．（CH3）3COHD．（CH3）3CCH2OH