作业帮GMAT题求解求最正确的一个选项并详解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
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GMAT题求解求最正确的一个选项并详解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
GMAT题求解
求最正确的一个选项并详解
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.
划线部分是：acting as sentinels and to sound
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
GMAT题求解求最正确的一个选项并详解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
因为是和前文的 defending 并列 所以,只能用acting 和 sounding
故答案为 B
GMAT题求解
悬赏分：5 - 离问题结束还有 13 天 21 小时
求最正确的一个选项并详解
Some bat caves,like honeybee hives, have residents that take on different duties such as defending the entrance,acting as sentinels and sounding a warning at the approach of danger,and scouting outside the cave for new food and roosting sites. 有些蝙蝠洞,就跟蜜蜂巢一样,里面的居民们各司其职,比如保卫入口、作为哨兵并且在危险到来之际发出警报、外出探查新的食物和栖息地.