—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

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1.
—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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高考英语复习专题试卷——情态动词