The police _ (leave) no stone unturned to trace the culprits.
Correct answer: A. Left
- A. Left
- B. Leave
- C. Leaves
- D. Leaving
Explanation
The sentence is in the past tense (the word 'unturned' is in past tense) hence the missing word should be in the past tense. "Left" is the past tense and a past participle of leave, hence is most suitable to use and is also grammatically correct when the sentence is said out loud."Leaves" is a third-person, singular simple present tense while "leaving" is a present participle.
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