—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

C


解析:

本題主要考查情態(tài)動(dòng)詞的用法。選項(xiàng)A表示事實(shí)上的可能或允許；選項(xiàng)B表示要求或肯定的推測(cè)；選項(xiàng)C表示建議或根據(jù)一般情況的推測(cè)；選項(xiàng)D表示較小的可能性。根據(jù)句子中的關(guān)鍵詞an effective answer可知，后面表示在一般情況下的推測(cè)。

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