—Iphonedyouyesterdaymorning.Agirlanswered,butIdidn’trec...

问题详情：

—I phoned you yesterday morning. A girl answered, but I didn’t recognize the voice.

—Oh, it ________ my younger sister. She was in my room at that moment.

A．must have been                                          B．should have been

C．could have been                                         D．may have been

【回答】

A

【详解】

考查情态动词。句意：—昨天上午我给你打电话。一个女孩回答的，但我没听出谁的声音。—哦，那一定是我妹妹。她那一刻正在我的房间里。情态动词加动词的现在完成式形式，表示对过去的推测。A. must have been表示一定做了某事。用于肯定推测；B. should have been 本应该，表示应该做而没有做某事。C. could have been用于肯定句时，表示可能做了某事。更常用于否定推测；D. may have been可能做过某事。表示可能*很小。结合语境判断，表示非常肯定的推测，故选A。

知识点：虚拟语气与情态动词

题型：选择题