A discovery in New Jersey actually contributed to the early economic development of the U.S. and, in 1714 a worker uncovered a g

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问题 A discovery in New Jersey actually contributed to the early economic development of the U.S. and, in 1714 a worker uncovered a green rock containing copper.

选项 A、when, in 1714
B、thus, in 1714
C、it was in 1714
D、till in 1714

答案A

解析 从句意可看出,画线处的后半部分“发现铜”才是因,前半部分“推动发展”是果,因此A项才正确。B项倒转了因果关系,错误。C项没有连接词让句子变成了有两个谓语,错误。D项意为“直到1714年”,语义错误。
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