大全-18题

freesimens

大全-18题，请大家帮忙看一下，多谢！

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（D）

(E) even though they beat in unison and adopt

请问A和C错误原因是不是因为没有表达出转折的意思？D选项在原文中做什

么成份？伴随状态？多谢！

excellences

我觉得C是肯定错误的。这里C做的成分是不明确的。这个句子的主谓宾都有了。所以后面我觉得应该是用分词结构或者从句来修饰主句的。A的确是少了一个转折的意思。

steveyangxt

beating in unison and adopting specialized orientations exclusive of one another.构成转折。