第30题: [单项选择]Sculpture has occasionally been found in the earth in an almost pure state. A. regularly B. accidentally C. sometimes D. successfully 参考答案:C 答案解析:[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。