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

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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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