听力原文:(A) Some building materials are piled up on the ground.(B) A brick wall is being
听力,原文,
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听力原文:(A) Some building materials are piled up on the ground.
(B) A brick wall is being built.
(C) Building materials are being loaded into a truck.
(D) Tools are scattered on the ground.

请帮忙给出正确答案和分析,谢谢!
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