The companies are working together to create ________ they hope will be the best means of transport in the 21st century.
A．whichB．that
C．whatD．who
C
C 考察名詞性從句。此處缺少賓語從句的連接詞，而從句________ they hope will be the best means of transport in the 21st century中they hope是插入語，因此缺少主語，所以起雙重作為what。
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