there must have been

• There must have been unknown factors . .
  一定有我们不知道的情况。 。 。
• There must have been unknown factors
  它一定被不明原因驱使
• I ' m terribly sorry . there must have been a mistake . i do apologize
  非常抱歉，一定是弄错了，我向您道歉。
• Doubtlessly , there must have been some reason that delayed the shipment
  毫无疑问，一定是由于某种原因耽误了装运。
• Kelly : there must have been a typo when the salesperson took your order
  一定是售货员在接您的订单时，打错了号码。
• There must have been an outhouse ， too ， but my mind never recorded it
  那里一定也有户外厕所，但我一点也记不起来了。
• There must have been in his life some strange secret that no one knows .
  他的一生中一定有某个谁都不知道的不可思议的秘密。 ”
• I think there must have been some misunderstanding ; i didn ' t order all these books
  我觉得这其中一定有误会，我并没有订这些全部的书。
• Where there is a reconciliation , stephen said , there must have been first a sundering
  “既然有和解， ”斯蒂芬说， “当初想必就有过纷争。 ”
• There must have been some unpleasant experiences for mr . b to become a doubting thomas
  （ b先生不信任他人，也许因为有不愉快的经验所致。 ）