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
what在此引导宾语从句,且在宾语从句中用作主语,其中的they hope可视为插入成分。句意为:这些公司齐心协力希望制造出21世纪最好的交通工具。
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