—How is the debate of your essay?
—It ____ well, but I ____one of the key points.
A.might work; hadn’t forgotB.needn’t have worked; forgot
C.could have worked; forgotD.would work; hadn’t forgot
C

試題分析:句意:--你的論文答辯怎樣?--它本來進(jìn)行地很好,但是我忘了其中的一個(gè)重點(diǎn)。needn’t have worked表示過去沒有必要做好,很顯然不符合語境;這里指過去本能進(jìn)行地很好,所以用could have worked,多于回答者來說答辯已經(jīng)結(jié)束,忘記重要的內(nèi)容也是發(fā)生在過去,所以應(yīng)該用過去式,故選C。
點(diǎn)評:本題難度適中。情態(tài)動(dòng)詞是高中階段的重要的語法項(xiàng)目,需要考生掌握它們的不同的語法及區(qū)別,尤其是情態(tài)動(dòng)詞的完成式表示對過去的推測,不同的情態(tài)動(dòng)詞推測的可能性大小上不同,需要考生理解它們的不同的語法。
即學(xué)即練:—I heard the phone ringing in the office next door.
—You ________ it. They haven’t got a phone yet.
A.couldn’t hear        B.couldn’t have heard
C.didn’t hear           D.wouldn’t have heard
解析:B。由句意可知此處是對過去的事情表示推測,那么否定句用“can/could not+完成時(shí)”,故選B。
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