题目

—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 答案：D 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。Where _____ the ruler ?A. is B. are