He passed the examination in the first class because he ......
-
was hard working for it
-
worked hardly for it
-
had worked hard for it
-
was working hard for itt
C
Correct answer
Explanation
The correct answer is 'had worked hard for it'. The past perfect tense 'had worked' is needed because working hard happened before passing the exam (past tense). 'Worked hardly' is incorrect because 'hardly' means barely/seldom. 'Was working hard' is past continuous which doesn't fit. Note: Option D has a typo 'itt'.