He has been working on and off for several years on this research project.
A. at intervals
B. continuously
C. rarely
D. painstakingly
Answer: Option A
Solution(By Examveda Team)
on and off: intermittently.Related Questions on Idioms and Phrases
A. To gain prominence
B. To praise oneself
C. To confess without of reserve
D. To destroy before it blooms
E. None of these
A. To become hungry
B. To be in good mood
C. To preserve ones energy
D. To be aloof from
E. None of these
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B. To catch a dangerous person
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A. To find one's roots
B. To return to place of rest
C. Back to original position
D. To emphasise
E. None of these
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