单选

178 children who are【B13】______in a multidisciplinary research

  • A.enrolled
  • B.registering
  • C.entering
  • D.manipulated
参考答案
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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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