单选题
--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
【正确答案】
B
【答案解析】
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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