---Icalledyouyesterday.Awomananswered,butIdidn’trecogni...

问题详情：

--- I called you yesterday. A woman answered, but I didn’t recognized her voice.

 ---- Oh,it _______ my aunt Sister Yuanyuan.

be      B. must have been        be        have been

【回答】

B

知识点：虚拟语气与情态动词

题型：选择题