Emergencies and unexpected situations happen all the time.

A. may B. can C. must D. should

 

B

【解析】

試題分析：句意：突發(fā)事件和意外情況可能總是會發(fā)生。這里使用情態(tài)動詞can，表示有客觀的可能性，A. may表示不確定的可能性， C. must必須，D. should應(yīng)該，所以選B。

考點: 考查情態(tài)動詞

 

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