题外话,你在攻OG11?为什么不是OG12呢?
因为在acting as sentinels and sounding a warning at the approcah of danger,里面sounding是sentinels发出的的动作,acting...and sounding...,逻辑上有先后因果次序,与其他的举例其实并不在一个层次,但是因为用and连接所以要用sounding形式。妄自揣测,acting as sentinels to sound a warning应该也是对的。
-- by 会员 hermit127 (2010/7/5 14:02:15)