The United States minted about 857 million silver-colored “Susan B. Anthony” dollars between 1979 and 1981, but the coin proved unpopular because it looked and felt too much like a quarter.
这个句子but做连词后面不是应该接完整的句子吗?那是不是应该是“but the coin was proved”?原句直接跟proved难道不是缺谓语吗?
十分感谢 ...NN们给解答一下吧!