d选项的having been based on is wordy, 并且it is unclear whether it modifies research conducted by the automobile company or the research conducted by the insurance company.
(A) were no Jane Austens or Brontë sisters ("were" works with both items because they're both plural)
(C) was not Jane Austen nor the Brontë sisters (singular "was" doesn't work with plural "sisters")
We can eliminate options C, D, & E because they use a singular verb with the plural Brontë sisters.
There were no Xs or Ys = CORRECT
There were not Xs or Ys = INCORRECT
C选项:especially if it has worked well in the past是条件状语。状语和定语均属于修饰成分,均具有就近修饰的原则。本选项中距离这个条件状语最近的句子是when they do appear。但是,在逻辑上,该条件状语应该是be committed to的修饰语。
有3.26考的嗎?