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. 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
考查情态动词及虚拟语气。could have done本可能做某事而实际上没有做,句意:他本可以得满分的,但是他是如此的粗心以至于犯了一个拼写错误。所以选C。
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