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_________ dangerous to climb the mountain.


  1. A.
    That's
  2. B.
    It's
  3. C.
    This is
  4. D.
    Is
B
解析:
本句的真正主语是不定式短语to climb the mountain.前边做形式主语,只能用it,不能用that.而系动词用is.
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