—Iphonedyouyesterdaymorning.Agirlanswered,butIdidn’trec...

問題詳情：

—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

【詳解】

考查情態動詞。句意：—昨天上午我給你打電話。一個女孩回答的，但我沒聽出誰的聲音。—哦，那一定是我妹妹。她那一刻正在我的房間裡。情態動詞加動詞的現在完成式形式，表示對過去的推測。A. must have been表示一定做了某事。用於肯定推測；B. should have been 本應該，表示應該做而沒有做某事。C. could have been用於肯定句時，表示可能做了某事。更常用於否定推測；D. may have been可能做過某事。表示可能*很小。結合語境判斷，表示非常肯定的推測，故選A。

知識點：虛擬語氣與情態動詞

題型：選擇題