大全的一道不明白的题SECTION C 19

大全SectionC

19.   Aviation officials have not only failed to determine the cause of the crash, but they have also ignored demands by the pilots union that the investigation should be expedited.

(A) crash, but they have also ignored demands by the pilots union that the investigation should be expedited

(B) crash but also ignored demands by the pilots union that the investigation be expedited

(C) crash but have ignored demands for expediting the investigation by the pilots’ union

(D) crash, but they are also ignoring the pilots’ union’s demands to expedite the investigation（B）

(E) crash: the demands by the pilots’ union that the investigation should be expedited have also been ignored

这道题选B的话crash后是不是应该有逗号才对啊？

找了半天没找到相应的解释，还恳请大家指点一二啊！

多谢~

大家帮忙解答一下吧~

好小的字...

B里面crash后面不需要逗号的.not only ... but also是平行连接词，而不是转折性连接词，而且这里B选项里but also后面不是完整句子而是fragment，不独立成句前面不该加逗号。

非常感谢aeoluseros的解答，现在明白啦！这是我第一次在这里提问题，没指望有人回的

真的太感谢了

继续努力！！！