求助og11紫皮第1题

llindar

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 outsides the cave for new food and roosting sites.

划线见括号内

B.acting as sentinels and sounding

请问大家正确答案B中的sounding 是和哪个平行的？如果是B 那么句中就有2个and，这与平行结构只有最后一个用and不是矛盾吗？谢谢！

lixinli

and sounding 前面没有，

mandyuuqq

对,同意楼上看法,注意后面那个and前的","是不能省的.

诡异儿

acting as sentinels and sounding 是一个局部并列,该局部并列同整个句子构

成大并列

karen_gao

sounding a warning 是和前面acting as sentinels 平行的，同时acting as sentinels and sounding a warning at the approach of danger仅代表different duties 中的一个，并和前面的defending the entrance以及后面的scouting outsides the cave for new food and roosting sites平行。。。类似这样的结构在GMAT中还有很多，即大平行结构中包含小平行结构。