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Option 3 : could not concentrated
The correct answer is "could not concentrated"
- The erroneous part of the sentence is 'could not concentrated'.
- In the given sentence, the verb concentrated is not correct with the modal verb 'could'.
- Modal verbs are followed by the bare infinitive form of the verb.
- Example: Roshan could sing that song.
The correct sentence is: In spite of my best efforts I could not concentrate on my studies.
Hence, the correct answer is option 3.
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