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精英家教網 > 高中英語 > 題目詳情

Is ____ dangerous to swim in the river alone?


  1. A.
    it
  2. B.
    this
  3. C.
    that
  4. D.
    he
A
解析:
本句it為作形式主語,不定式短語放在后面作真正主語。
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