Tom _____ full marks, but he was too careless and made a spelling mistake.
A．could gainB．could have gainedC．must have gainedD．must gain
B

試題分析：句意：湯姆本可以得到滿分的，但是他太粗心了，犯了一個(gè)拼寫錯(cuò)誤。從but he was too careless and made a spelling mistake.可知是說明的過去的事情，排除AD，could have done“本可以做而沒有做”是虛擬語氣，符合句意，must have done過去一定做了，不符合句意，所以選B。
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