She _____ your birthday party, but she had to look after her mother in hospital．
A．should attendB．ought to have attended
C．can have attendedD．must have attended
B

試題分析：考查情態(tài)動(dòng)詞用法。本題是虛擬語(yǔ)氣，根據(jù)but后面的had說(shuō)明本題是對(duì)過(guò)去情況的虛擬，使用情態(tài)動(dòng)詞+have done的形式。C項(xiàng)表示推測(cè)，指可能做了某事；D項(xiàng)指一定做了某事；ought to have done本應(yīng)該做某事，實(shí)際上卻未做；句意：她本應(yīng)該來(lái)參加你的生日聚會(huì)的，但是她不得不照顧她生病住院的媽媽。故B正確。
點(diǎn)評(píng)：注意but后面的句子使用陳述語(yǔ)氣，前面的句子要根據(jù)后面句子的時(shí)態(tài)來(lái)決定虛擬語(yǔ)氣的形式，
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