Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select No substitution required.
The cause of the disaster has not yet known but an enquiry has been set up to find out what happened.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. is not yet known.
- In the given statement two tenses have been used at the same time that is not possible and we need to follow a time sequence.
- As the second part of the statement is in "perfect tense" we need to use 'simple tense" in the first part of the statement.
- So, we need to replace "has" with "is" for making the statement grammatically correct.
- As the chosen option follows this rule it will be correct.
The correct sentence will be-
The cause of the disaster is not yet known but an enquiry has been set up to find out what happened.