Some of the tenth-century stave churches of Norway are still standing, demonstrating that with sound design and maintenance, wooden buildings can last indefinitely.
(D) standing, and they demonstrate wooden buildings can last indefinitely when there is sound design and maintenance(A) (E) standing, and they demonstrate how a wooden building can last indefinitely when it has sound design and maintenance
DE两个选项都用了,and结构
这里我觉的应该不用加逗号把?直接and they怎么怎么样,如果按这个逻辑想,DE就直接秒排除了,感觉又不太对..
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