The solders are sending _____ is badly needed to the earthquake-hit area by road.A as B that

题目

The solders are sending _____ is badly needed to the earthquake-hit area by road.A as B that
C.which D .what

答案

答案选D
既要充当 is badly needed to the earthquake-hit area by road.主语成分,又要充当Send 的宾语成分,故只有what合适