【题目】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.one D.what
【答案】D
【解析】
考查宾语从句。句意:两家公司正在共同努力,希望创造出21世纪最好的交通工具。此处是宾语从句,they hope是插入语,连接词在从句中做主语,应使用what引导,指代事物。故选D。