--- __________?

--- Two years ago.

A. Where did he go

B. How long has he been in America

C. When did he go to America

相关问题推荐

• It's a long way to get there. This is _____we started so early.

  A. what

  B. how

  C. why

  查看答案

• Mary is very hard-working, _______ ?

  A. doesn’t she

  B. isn’t

  C. won’t she

  查看答案

• 补骨脂中所含香豆素属于简单香豆素。()

  查看答案
• 月湖开凿于唐代的贞观年间,因其圆处似满月,曲处如眉月,故而得名。()

  此题为判断题(对，错)。

  查看答案

• 香豆素的1hnmr中化学位移3.8～4.0处出现单峰，说明结构中含有甲基。()

  查看答案