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--- Who told you my address ? --- I don’t remember clearly. It _____ Li Mei.
  ---It _____ Li Mei. She doesn’t know it.
A.can be; mustn’t beB.may have been;must have been
C.may have been; can’t be    D.must have been ; can’t have been
C
本题考查情态动词。句中may也许,可能之一,为不肯定的推测;can’t不可能。句意:——谁告诉你我的地址的?——我记不清了,也许是李梅。——不可能是李梅,她不知道。
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