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When I was a child, I _______ understand adults but now I don't.

  • A.do
  • B.should
  • C.could
  • D.must

Answer: C

The answer is could: 'When I was a child, I could understand adults but now I don't.'

'Could' is the past form of 'can' and expresses ability in the past, which is what the sentence contrasts with the present ('but now I don't').

'Do' is present tense and does not fit 'When I was a child'. 'Should' expresses obligation or advice, and 'must' expresses necessity; neither describes a past ability.

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