题目内容
He ________ full marks, but he was so careless to make a spelling mistake.
- A.must have gained
- B.can have gained
- C.could have gained
- D.must gain
C
解析:could have gained指“本来能获得,但事实上没有”。
解析:could have gained指“本来能获得,但事实上没有”。
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