7．-What did you say to your sister？I saw her crying in the room．
-It        my fault．I just said hello to her when I met her，nothing else．（　　）
A．must have beenB．can't have been
C．oughtn't to beD．should have been

分析 --你對你妹妹說什么了？我看見她在房間里哭．
--不可能是我的過錯．我僅僅是和她打招呼了，沒其它的．

解答 答案是B．本題考查"情態(tài)動詞+have done"的結(jié)構．對過去的或已經(jīng)發(fā)生的事件的說明往往用"情態(tài)動詞+have done"的結(jié)構，由問句中的did和saw可知事件已經(jīng)發(fā)生，所以用"情態(tài)動詞+have done"的結(jié)構，排除C．must have done表示推測，表示"肯定已經(jīng)…"；can't have done表示"不可能已經(jīng)…"；should have done是虛擬語氣，表示"本應做但事實上卻沒有做"；根據(jù)句意"我僅僅是和她打招呼了，沒其它的．"推斷妹妹哭"不可能"是我的過錯，故答案選擇B．

點評 要在正確理解情態(tài)動詞的基本含義的基礎上，整體理解語境中的情感態(tài)度，做出合理的判斷．

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