Tom _____ full marks, but he was too careless and made a spelling mistake.A．coul
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Tom _____ full marks, but he was too careless and made a spelling mistake.| A．could gain | B．could have gained | C．must have gained | D．must gain |
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答案
| B |
解析
试题分析：句意：汤姆本可以得到满分的，但是他太粗心了，犯了一个拼写错误。从but he was too careless and made a spelling mistake.可知是说明的过去的事情，排除AD，could have done“本可以做而没有做”是虚拟语气，符合句意，must have done过去一定做了，不符合句意，所以选B。 |
举一反三
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