--- 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
本題考查情態(tài)動詞。句中may也許,可能之一,為不肯定的推測;can’t不可能。句意:——誰告訴你我的地址的?——我記不清了,也許是李梅。——不可能是李梅,她不知道。
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