Sulphur has occasionally been found in th
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Sulphur has occasionally been found in the earth in an almost pure state.
A:regularly B:accidentally C:sometimes D:successfully
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答案：C
本句话的意思：“地球上偶然发现了几乎纯态的硫。,, occasionally与sometimes意思相近，意为“有时，偶尔”，如：I drink coffee only occasionally.我只是偶尔才喝咖啡。 regularly意为“定期地，有规律地”，如：The doctor told him to check his blood pressure regularly.大夫要他定期地查血压。accidentally意为“意外地，偶然地”，如：I accidentally found the book I had been looking for．我偶然发现了我一直想要的书。successfully意为“成功地”，如：We have completed the experiment successfully.我们成功地做完了实验。