问题补充:
I wonder that makes him so sad.
A. why it does
B. what he does
C. how it is
D. what it is
答案:
A. why it does
B. what he does
C. how it is
(答案→)D. what it is
解析:考查强调句型。强调句型的结构为:It is/was 被强调成分 that/who 其他成分。把it is/was及that/who去掉,句子仍然是正确的。本题考查了强调句型的特殊疑问句。What 在句子是主语。句意:我想知道是什么让他如此难过。