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

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

—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

试题答案

C

标签：toanswereffectiveandproblem

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