“I called you yesterday. A woman answered, but I didn’t recognize her voice.” “Oh, it _____ my aunt Jean.”
A．must beB．must have been
C．might beD．can have been
B
對(duì)過(guò)去情況的肯定推測(cè)，宜用“情態(tài)動(dòng)詞 + 動(dòng)詞完成式”，再根據(jù)句意，可確定答案為B。注：can 表示推測(cè)通常不用于肯定陳述句。
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