Identify the segment in the sentence. Which contain the grammatical error.
She has been working tirelessly since hours.

Options

A. tirelessly
B. been working
C. She has
D. since hours

Answer

D

Explanation

Since is used to denote a point of time and for depicting an activity that is happening from a long time like since time immemorial/since ancient times. "For" is used for a fixed period of time(countable) like 2 years/3 months/4 days/8. hours and for an activity that happened in a recent time. However, in the given question, we can count the working hours. Hence, for hours will be answer.