Verbal Ability - Sentence Improvement - Discussion

Discussion :: Sentence Improvement - Section 1 (Q.No.56)

In questions given below, a part of the sentence is italicised and underlined. Below are given alternatives to the italicised part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer.

56. 

Why the dinosaurs died out is not known.

[A]. it is not known
[B]. the reason is not known
[C]. that is not known
[D]. No improvement

Answer: Option D

Explanation:

No answer description available for this question.

Kekin said: (Jan 31, 2011)  
please let me know how following sentence can be left without improvement

Vikas said: (Apr 12, 2017)  
Why not B?

Kimi said: (Sep 26, 2017)  
Why option B is not an answer?

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