. He __________ full marks, but he was so careless as to make a spelling mistake.
A．must have gainedB．can have gainedC．could have gainedD．must gain
C
考查情態(tài)動詞及虛擬語氣。could have done本可能做某事而實際上沒有做，句意：他本可以得滿分的，但是他是如此的粗心以至于犯了一個拼寫錯誤。所以選C。
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