---How did you do in the test yesterday?
-----Not so well. I ______ much better but I misread the directions for writing。
A．will have doneB．could have done
C．must have doneD．may have done
B
考查虛擬語氣。ACD三項都不能用來表示虛擬語氣。句意：—在昨天的考試中你表現(xiàn)怎么樣?—不是很好。我本可以做得更好，但是我看錯了寫作的要求。Could have done本可以做，實際上卻未做。故B正確。
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