—I just wonder that made Mark Twain so famous a writer.
—Of course his early experiences.
A. it was what
B. what he did
C. how he did
D. what it was
网友回答
A. it was what
B. what he did
C. how he did
(答案→)D. what it was
解析：考查强调句的特殊疑问句和语序。从题干的含义看，本题涉及强调句的特殊疑问句和语序。被强调的成分在原句做主语，表示物，用what，疑问句在本题做宾语，用陈述句的语序，因此选D。