Difficulty: Easy
Correct Answer: accurate
Explanation:
Given sentence
Our office clock is not so correct as it should be; it is usually five minutes fast.
Concept/Approach
For instruments, the natural adjective is accurate, meaning 'showing the correct time'.
Correction
'not so correct as' → more idiomatic as 'not as accurate as …'
Why others are suboptimal
'right' → informal and less precise.'regular' → refers to interval/consistency, not exactness.'No improvement' → retains weaker diction.
Final Answer
accurate
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