Tony ________ full marks, but he was so careless as to make a spelling mistake.
题型：不详难度：来源：
Tony ________ full marks, but he was so careless as to make a spelling mistake.| A．could have gained | B．can have gained | | C．must have gained | D．must gain |
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答案
| A |
解析
试题分析：句意：Tony本来可以得满分的，但是他太粗心了，犯了一个拼写错误。could have gained表示过去本来可以做的事而没做；can have gained表示对过去情况的怀疑或不确定；must have gained表示对过去发生的事情或状态进行推测，选A。 |
举一反三
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