The US 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.
这个转折在句中做什么成分呢,这个答案用了proved而不是was proved,为什么???
通常用prove,不用被动式
表达的是我们通常人为"被prove"的意思.
反正看到prove的被动式通常都是迷惑选项
恩~恩 知道了~~
看来语法还有好多漏洞啊
2L正解
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