题目内容
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
C
该句中they hope是插入语,故“ will be the best means of transport in the 21st century”实际上是create的宾语,且缺少宾语从句的连接词,并且该连接词要指物且在从句中作主语,what可以起到该作用。

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