Identify the segment that contains a grammatical error. If there is no error, select 'No error'.
The timescale of prokaryote evolution / have been difficult to reconstruct / because of a limited fossil record.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. have been difficult to reconstruct.
The error in the sentence is related to the subject-verb agreement.
The subject of the sentence "The timescale" is singular.
So, the plural verb "have" is incorrect here.
Here, "have" should be replaced with the singular verb "has".
The correct sentence will be: The timescale of prokaryote evolution has been difficult to reconstruct because of a limited fossil record.