问题补充:
The companies are working together to create they hope will be the best means of transport in the 21st century.
A. what
B. that
C. which
D. who
答案:
(答案→)A. what
B. that
C. which
D. who
解析:考查从句,从句they hope缺少宾语,所以从关系代词里选择引导词,ABCD都可以做宾语,但是表示的意思不同,what表示什么;that只起连接作用;which表示哪一个;who表示人,所以选A