You must set off at once, ______you would be late for school.


  1. A.
    then
  2. B.
    and
  3. C.
    otherwise
  4. D.
    so
C
考查連詞的用法。句意：你必須馬上出發(fā)，否則的話你就會上學遲到的。Otherwise否則，要不然。
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