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.我偶然找到我一直在找的书。successfully:成功地。 We have completed the experiment successfully.我们成功地做完了实验。
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