_____rapidly by the body, sugar provides a quick energy source


  1. A.
    Digested
  2. B.
    Digesting
  3. C.
    To digest
  4. D.
    Having digested
A
考查非謂語動詞。主語sugar與digest之間是被動關(guān)系，所以用過去分詞選A。
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