问题补充:
the tomb, his bird was eaten by a snake.
A. As soon as entered
B. When entering into
C. On entering
D. Upon entered
答案:
A. As soon as entered
B. When entering into
(答案→)C. On entering
D. Upon entered
解析:考查”一…就…”的表达:A项是as soon as he entered,B是enter后面不加介词,C项是on doing sth,D项upon entering,句意是:一进入这个坟墓,这个鸟就被蛇吃了。选C。