beginning为什么双写n

　　Could you go back to the beginning of the story?

　　你能不能回到故事的开头？

　　She's been working there since the beginning of last summer.

　　她自从去年夏初起就一直在那里工作。

　　At last things were beginning to look up.

　　情况终于开始好转了。

　　The cracks in the government's economic policy are already beginning to show.

　　政府经济政策中的失误已开始显露出来。

　　The job was beginning to make unreasonable demands on his free time.

　　他的闲暇时间开始被工作过分地侵占了。