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. which
B. that
C. what
D. who
答案：
A. which
B. that
(答案→)C. what
D. who
解析：考查宾语从句的关系词。What 表示“所创造的事物”。
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