While crossing the street, _________．


  1. A.
    the light must be green
  2. B.
    there are no policemen
  3. C.
    be careful
  4. D.
    it is necessary to be careful
C
題意是“過大街時，一定要小心”。當主句的主語和從句的主語相同時，從句可以改為引導詞加分詞形式，反過來，從句是引導詞加分詞形式，主句必須和從句保持主語一致。C項是祈使句，其主語是you。該句可改為You must be careful while you are crossing the street．
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