问题
选择题
The companies are working together to create _____ they hope will be the best means of transport in the 21st century.
A．which
B．that
C．what
D．who
答案
答案：C
题目分析：考查从句，从句they hope缺少宾语，A. which可以做宾语，但是没有先行词；B. that不做成份；C. what做宾语，表示…事情；D. who没有表示人的先行词，所以选C
点评：做从句题时，首先看从句是否缺少成份，如果缺少就在关系代词里找引导词；如果不缺少成份，就在关系副词里选择引导词