gwd31-13，好像选不出答案，请NN帮忙啊！

ghostbuster

C答案后边少写了一个with,所以加上后,c是正确的.考试遇到就看后边是不是加了with,如果加了就是c了.

shouyang12

Dolphins lack vocal cords, nevertheless creating sounds: a complicated system of whistles, Squeaks, moans, trills, and clicks are produced by sphincter muscles inside the blowhole.

A: nevertheless creating sounds: a complicated system of whistles, squeaks, moans, trills, and clicks are produced by

B: nevertheless creating sounds: they produce a complicated system of whistles, squeaks, moans, trills, and clicks with   应该用by

C: but they do create sounds, producing a complicated system of whistles, squeaks, moans, trills, and clicks being produced  缺少by 

D: but they do create sounds, a complicated system of whistles, squeaks, moans, trills, and clicks being produced   缺少by

E: but nevertheless creating sounds: a complicated system of whistles, squeaks, moans, trills, and clicks produced by  “but”是连词，分句没有胃语

只能选A

fighteding

b冒号后的they指代不清，理论上they应该指代前面的sounds，因为whisthle，squeaks，moans都是各种各样的声音，但是they同样也可以指代海豚

c的being应该省掉，

a使用被动语态躲避了指代不轻的they，所以只能选a。

open to discuss

chamcham

A: nevertheless creating sounds: a complicated system of whistles, squeaks, moans, trills, and clicks are produced by

so B

so B

mimixiaxia

up

eileenmu木

up

notidgen

up

jackieli007

~~