2. 外语
  3. Sulphur has occasionally been found in the earth in an almost pure state.

Sulphur has occasionally been found in the earth in an almost pure state.

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问题 Sulphur has occasionally been found in the earth in an almost pure state.
选项 A、regularly
B、accidentally
C、sometimes
D、successfully
答案C
解析 occasionally与sometimes意思相近：有时，偶尔。I drink coffee only occasionally．我只是偶尔才喝咖啡。regularly：定期地，有规律地。The doctor told him to check his blood pressure regularly．大夫要他定期地查血压。accidentally：意外地，偶然地。I accidentally found the book I had been looking for．我偶然碰到我一直想要的书。successfully：成功地。We have completed the experiment successfully．我们成功地做完了实验。
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