这些旧书在潮湿的地下室里慢慢腐烂了。
The old books slowly ___moldered in the damp basement.
那堆落叶在角落里慢慢腐烂。
The pile of leaves is slowly ___moldering in the corner.
那些旧书在阁楼上无人问津，渐渐发霉腐朽。
The old books were left ___moldering in the attic for years.
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