—How did your mathematics exam go？
—I thought I           ，but in fact I fell behind in the class.
A．should have been the top 10B．could have been the top 10
C．may have been the top 10D．need have been the top 10
B
考查虛擬語(yǔ)氣。句意：你的數(shù)學(xué)考試怎么樣？——我認(rèn)為我能進(jìn)前十名，但是實(shí)際上我在班里名落孫山。表示對(duì)過(guò)去事情的假設(shè)，意思是本來(lái)能夠做某事而沒(méi)有做，用“could+have+done”，故選B。
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