This wall of air is an effective answer to the problem and it ____ work.

—This wall of air is an effective answer to the problem and it ____ work.

—But it is a question to put such a wall of air around the statue.

A．may B．must C．should D．could

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C 本题主要考查情态动词的用法。选项A表示事实上的可能或允许；选项B表示要求或肯定的推测；选项C表示建议或根据一般情况的推测；选项D表示较小的可能性。根据句子中的关键词an effective answer可知，后面表示在一般情况下的推测。

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