摘要： ---- 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 been B. must have been; mustn’t have been C. may have been; must have been D. must have been; mustn’t be 答案:A. 根据题意“I don’t remember 可知第一空是要表达“可能是Karen 的) ,又根据“She doesn’t know my email address. 可知说话人认为“不可能是Karen. .
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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 been B. must have been; mustn’t have been
C. may have been; must have been D. must have been; mustn’t be
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