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While the tunnel, the workers discovered an underground lake.A.buildB.builtC.bui

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While the tunnel, the workers discovered an underground lake.A.buildB.builtC.bui

While __________ the tunnel, the workers discovered an underground lake.

A.build

B.built

C.building

D.to build

试题答案

C

标签：workersdiscoveredanwhilethe

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