【正确答案】
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。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.我偶然碰到我一直想要的书。successfully:成功地。we have completed the experiment successfully.我们成功地做完了实验。