单选题 Sulphur has occasionally been found in the earth in an almost pure state.
  • A. regularly
  • B. accidentally
  • C. sometimes
  • D. successfully


【正确答案】 B
【答案解析】[解析] 本题是对副词的考查。题干划线词occasionally意为“偶尔地”，四个选项中：regularly意为“规律地”，accidentally意为“偶尔地”，sometimes意为“有时”，successfully意为“成功地”。因此正确答案为B。