◎ 题干
At a construction site in our city the workers have uncovered an ancient wall that_______ to keep the
enemy out of the city, but it requires further evidence.
[     ]
A. might have functioned                              
B. would have functioned
C. must have functioned                              
D. should have functioned
◎ 答案
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◎ 解析
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◎ 知识点
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