________ is no doubt that he will come here some day, but ________ is doubtful when he will come.


  1. A.
    There; there
  2. B.
    It; it
  3. C.
    There; it
  4. D.
    It; there
C
解析：
導(dǎo)解：第一句為there be句型，主語是名詞doubt；
第二句為it作形式主語，doubtful是形容詞作表語．
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