All theWorkers are busy ______ the bridge.A、buildB、buildingC、builtBbe busy do

游客2025-07-10  0

问题 All theWorkers are busy ______ the bridge.

选项 A、build
B、building
C、built

答案 B

解析 be busy doing sth.为固定用法,意为是“忙于做某事”。
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