--- Who told you my email address? --- I don’t remember clearly. It Karen. --- I

--- 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

试题答案

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.”