I        my homework yesterday, but unfortunately I forgot about it totally.
A．need have handed inB．should have handed in
C．must have handed inD．may have handed in
B

試題分析：考查虛擬語(yǔ)氣。But后面的句子使用陳述語(yǔ)氣，前面的句子使用虛擬語(yǔ)氣。本題But后面的句子使用了過去時(shí)，故前面的句子是與過去事實(shí)相反的虛擬語(yǔ)氣。need have done需要做某事，實(shí)際上卻沒有做；should have done本應(yīng)該做某事，實(shí)際上卻未做；must have done一定做了某事（表示推測(cè)）；may have done也許做了某事（表示推測(cè)）；句意：我本應(yīng)該昨天交作業(yè)，但是不幸的是我完全忘記了。
點(diǎn)評(píng)：“情態(tài)動(dòng)詞+have done”可以表示對(duì)過去的虛擬或者推測(cè)。need have done需要做某事，實(shí)際上卻沒有做；should have done本應(yīng)該做某事，實(shí)際上卻未做；must have done一定做了某事（表示推測(cè)）；may have done也許做了某事（表示推測(cè)）；
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