单选

Boys were not completely【B18】______Irregular bedtimes left their

  • A.unchanged
  • B.unaffected
  • C.unaltered
  • D.unmoved
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【B17】______a regular bedtime did seem to affect their cognition.

  • A.having not had
  • B.having had not
  • C.not having had
  • D.not having
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