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1.        A peculiar feature of the embryonic mammalian circulatory system is that in the area of the heart the cells adhere to one another, beating in unison and adopting specialized orientations exclusive of one another.

(A) beating in unison and adopting

(B) they beat in unison while adopting

(C) beat in unison, and adopt

(D) beating in unison yet adopting

(E) even though they beat in unison and adopt

不太明白这句话的结构，是同位语考点么？

我选的C，因为想和adhere平行，为什么不对呢？

谢谢~

这个题目讨论贴里有很详细的说明了，楼上为什么不去搜一下呢？

1、这题中C用并列的动词形式，表达意思不如分词在句末做伴随状语表达的准确。

2、beating in unison 和adopting specialized orientations exclusive of one another从意思上应该可以看出有转折的意思，因此用yet比用and好