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15. According to the latest study , most traffic accidents    be prevented if drivers are careful enough.

A. must   B. can

C. have to    D. need

 

15.   B 考查情态动词。句意:根抿最近的研究,如果司机足够小心的话,大部分交通事故是可以避免的。must必须;can, 能够;可能;have to不得不;need需要。这里使用can表示客观的可能性。所以选B。

题目来源:2015全品语法快练高中英语新课标 > 训练25 情态动词和虚拟语气

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