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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：
本句的真正主語是不定式短語to climb the mountain．前邊做形式主語，只能用it，不能用that．而系動詞用is．
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