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Complete the sentence below by choosing the most appropriate prefix from the given, options below :

It was not just rudeness; they were completely __________ efficient too.

  • A.ill
  • B.un
  • C.in
  • D.over

Answer: C

The correct prefix is in, giving inefficient.

The prefix in- means 'not', and inefficient means not achieving results with the least waste of time or effort: they were not just rude but completely inefficient too.

'Unefficient' and 'illefficient' are not English words, though un- and il- make other negatives (unhappy, illegal). 'Overefficient' would praise them, which contradicts the complaint in the sentence.

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