The detective left no stone unturned
In the following question, four alternatives are given for the idiom/phrase in bold and italics in the sentence. Choose the alternative which best expresses the meaning of idiom/phrase.
The detective left no stone unturned to trace the culprit.
took no pains
did very irrelevant things
resorted to illegitimate practices
used all available means
Correct answer is D
No explanation has been provided for this answer.
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