E.g The smelting and casting of copper were unknown among people.
系动词究竟应该跟 smelting and casting 还是copper?实在是题目做得晕了。。。谢谢
举报
你是指单复数的问题吧?要看“中心词”的,大多数情况是of前面的部分,也就是smelting and casting,所以用复数。
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