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8.     Some of the tenth-century stave churches of Norway are still standing, demonstrating that with sound design and maintenance, wooden buildings can last indefinitely.

(A) standing, demonstrating that with sound design and maintenance, wooden buildings can last indefinitely

(B) standing, demonstrating how wooden buildings, when they have sound design and maintenance, can last indefinitely

(C) standing; they demonstrate if a wooden building has sound design and maintenance it can last indefinitely

(D) standing, and they demonstrate wooden buildings can last indefinitely when there is sound design and maintenance

(E) standing, and they demonstrate how a wooden building can last indefinitely when it has sound design and maintenance

答案是A, 可是我总觉得第2个逗号用得很奇怪，好像把wooden buildings can last indefinitely从demonstrating that 。。。里分离了。

B虽然罗唆了点儿，但when they have sound design and maintenance前后两个逗号清楚说明句子成分。

晕

A. demonstrate that ... +

    with sound design and maintenance, wooden buildings can last indefinitely.

B.  1) demonstrate how 能演示 how 么？

      2) when 不合适，原文想表达的是 if

      3) they 指代谁呢？ churches, buildings