一道语法题（主要是想搞清楚一个知识点） - ChaseDream

In addition to being China’s first administrators, in the sense that they developed a coherent bureaucracy for their empire, the first literate culture in East Asia were the Shang, and they were well known for crafting ornate bronze ritual vessels.

答案选D，我不明白的主要就是the Shang的谓语为什么用复数？请大牛指教。

以下是引用denglei在2007-10-10 11:51:00的发言：

39. GWD30-Q39:

In addition to being China’s first administrators, in the sense that they developed a coherent bureaucracy for their empire, the first literate culture in East Asia were the Shang, and they were well known for crafting ornate bronze ritual vessels.

the first literate culture in East Asia were the Shang, and they were well known for crafting
the first literate culture in East Asia were the Shang, well known as the crafters of
the Shang, as the first literate culture in East Asia, is well known for its crafting
the Shang were the first literate culture in East Asia and are well known as the crafters of
the Shang were the first literate culture in East Asia and well known for its crafted

答案选D，我不明白的主要就是the Shang的谓语为什么用复数？请大牛指教。