问题：
[单选] Sulfur has occasionally been found in the earth in an almost pure state.A . regularly
B . accidentally
C . sometimes
D . successfully
参考答案：C
参考解析：
本题暂无解析
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问题：
[单选] Sulfur has occasionally been found in the earth in an almost pure state.A . regularly
B . accidentally
C . sometimes
D . successfully
参考答案：C
参考解析：
本题暂无解析
声明：有的资源均来自网络转载，版权归原作者所有，如有侵犯到您的权益
请联系本站我们将配合处理！