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.

admin2009-06-15  173
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
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