In the question below, choose the expression or words which best completes each sentence:

He is very tired. He really is .... staying up late

  • A getting used to
  • B not used to
  • C got used to
  • D used to
  • E being used to

The correct answer is B. not used to

The sentence “He is very tired. He really is not used to staying up late” means that he is not accustomed to staying up late, which is why he is very tired. 

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