18. 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
答案是D
beating in unison yet adopting作状语修饰adhere??。能不能 beat in unison ,yet adopt?
beating in unison yet adopting作状语修饰adhere??。能不能 beat in unison ,yet adopt? | 
