The engineers Amade two big plans Bfor the dam,one of Cwhat was never put Din us

游客2024-01-18  7

问题 The engineers Amade two big plans Bfor the dam,one of Cwhat was never put Din use.

选项 A、 
B、 
C、 
D、 

答案 C

解析 C项改为which,指代前句的two big plans。
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