没找到这题的讨论帖,只好重开。
1. Some bat caves, like honeybee hives, have residents that take on different duties such as defending the entrance, acting as sentinels and to sound a warning at the approach of danger, and scouting outside the cave for new food and roosting sites. (A) acting as sentinels and to sound (B) acting as sentinels and sounding (C) to act as sentinels and sound (D) to act as sentinels and to sound (E) to act as a sentinel sounding
答案是B,OG的解释是说sounding, defending, acting, scouting是parallel的。那请问为什么这里sounding和scouting之前
都有and?并列成分不是最后一个词之前加and就可以了么?
请NN指教。 |