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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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