题干
Don't sigh over the small achievement. _____ , and I'm sure if you keep at it, you'll see the light at the end of the tunnel!
| A．Lookers-on see most of the game |
| B．Constant dropping wears away the stone |
| C．The world is your oyster |
| D．Lost time is never found again |
答案(点此获取答案解析）
