请教：大全18题和23题

fankser

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)[fTimes]criticized the city‘s election board for, first of all, failing to replace outmoded voting machines prone to breakdowns, and secondarily, for their failure to investigate allegations of corruption involving board members.

(A) secondarily, for their failure to

(B) secondly, for their failure to

(C) secondly, that they failed and did not

(D) second, that they failed to

(E) second, for failing to

答案选E，可为什么first of all后面没有加for, second后面就要加个for呢？

请NN指教，欢迎大家讨论，万分感谢！

verygong

第二题，虽然答案比较确定，但是对于楼上的问题也不是很确定。我想大概是因为first of all 和second都是做插入语，所以并不会影响句子的并列结构!!!

fankser

可为什么board后面的for，在first of all 前面出现，却在second 后面出现呢？

不是应该省去second后面的for吗？

taoyeye

第2题的for是在board后面的for

fankser

谢谢~请问第2题又是何解？

verygong

第一题中，两个动词在逻辑上有转折，所以用yet比较适合，而且C选项改变了原句中的合理

重心。