题目信息
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
C:but they do create sounds, producing a complicated system of whistles, squeaks, moans, trills, and clicks with
D:but they do create sounds, a complicated system of whistles, squeaks, moans, trills, and clicks being produced
E:but nevertheless creating sounds: a complicated system of whistles, squeaks, moans, trills, and clicks produced by
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正确答案：
C:but they do create sounds, producing a complicated system of whistles, squeaks, moans, trills, and clicks with
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