???????
?????Attributive Clause)
?IELTS?????????????????
??:
    ??????????????????????????????????????????????????????????????????????????????????????????????????????????
    ??:
  (I)The boy who is standing is Tom.
        (??)?????????
      who is standing?????who????????????who????boy,
        who ????????
(2) I don�t know the reason why he was absent.
    ???????????
    why he was absent?????????????????why???? reason.
    why??????????

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