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 应改为which。分析句子结构可知,逗号后面为非限制性定语从句,又因先行词为plans,所以引导词要用which。
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