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

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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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TheengineersAmadetwobigplansBforthedam,oneofCwhatwasneverputDinus