Identify the part of the sentence that contains a grammatical error.
The researchers insisted (1)/ on replacing the control group (2)/ by another cohort (3)/ with matched characteristics. (4)
Show answer & explanation
Correct answer: C
Explanation
Correct Answer: (3)
Explanation
• The error lies in part (3) of the sentence.
• The verb replace takes the preposition with (not by) when indicating the substitute: replace something with something else.
• Part (3) should read with another cohort instead of by another cohort.
Correct Sentence: The researchers insisted on replacing the control group with another cohort with matched characteristics.