2. 公务员
  3. — I called you yesterday. A woman answered, but I didn’t recognize her voice. — Oh, it_____my aunt Jean.

— I called you yesterday. A woman answered, but I didn’t recognize her voice. — Oh, it_____my aunt Jean.

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问题 — I called you yesterday. A woman answered, but I didn’t recognize her voice. — Oh, it_____my aunt Jean.
选项 A、must be
B、must have been
C、might be
D、can have been
答案B
解析 对过去情况的肯定推测应用“情态动词+have+过去分词”，且根据句意，可以推断B为正确答案。注意：can表示推测时通常不用于肯定陈述句。
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