单选题 Once ______, the exhibition can ______.
  • A. seeing... be never forgotten
  • B. seen... never forget
  • C. seen... never be forgotten
  • D. seen... ever be forgotten
【正确答案】 C
【答案解析】[解析] 这个展览一旦被人看了就永远不会忘记。=Once (the exhibition was) seen by...。