【题目】The companies are working together to create _________ they hope will be the best means of transport in the 21st century.
A.whichB.thatC.oneD.what
在线课程【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。