28. ---- Who told you my email address?
---- I don’t remember clearly. It _______ Karen.
---- It _______ Karen. She doesn’t know my email address.
A．may have been; can’t have beenB．must have been; mustn’t have been
C．may have been; must have beenD．must have been; mustn’t be
A。
根據(jù)題意“I don’t remember”可知第一空是要表達“可能是Karen
的）”；又根據(jù)“She doesn’t know my email address. ”可知說話人認為“不可能是Karen.”.
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