—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
考查虛擬語氣。句意：你的數(shù)學考試怎么樣？——我認為我能進前十名，但是實際上我在班里名落孫山。表示對過去事情的假設，意思是本來能夠做某事而沒有做，用“could+have+done”，故選B。
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