“I called you yesterday. A woman answered but I didn’t recognize her voice.” “Oh it my

问题补充：

“I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it my aunt Jean.”

A. must be

B. must have been

C. might be

D. can have been

答案：

A. must be

(答案→)B. must have been

C. might be

D. can have been

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