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

 

A

【解析】考查虛擬語氣。might have done 意為“過去可能是做什么的”，是對過去肯定的猜測。句意為：在市里的一處工地上，工人們挖出了一道以前可能是用來御敵的城墻，但這還有待進(jìn)一步驗(yàn)證。根據(jù)句意選A。

 

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