These pieces of wood have ______ and become useless because of too much rainfall.

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问题 These pieces of wood have ______ and become useless because of too much rainfall.

选项 A、disappeared
B、decayed
C、altered
D、transformed

答案B

解析 decay“腐烂”。主要根据题中“wood”的性质以及下文“become useless because of too much rainfall”的暗示。
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