问题
选择题
He ______ full marks, but he was so careless as to make a spelling mistake.[ ]
A. must have gained
B. can have gained
C. could have gained
D. must gain
答案
答案：C
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He ______ full marks, but he was so careless as to make a spelling mistake.[ ]
A. must have gained
B. can have gained
C. could have gained
D. must gain
答案：C