题目内容

According to the latest study，most traffic accidents     be prevented if drivers are careful enough．
A．mustB．canC．have toD．need
B

试题分析：句意：根据最近的研究，如果司机足够小心的话，大部分交通事故都可以防止的。四个选项的含义分别是：A．must必须，B．can能够，可能，C．have to不得不， D．need需要，这里使用can表示“有客观的可能”，所以选B。
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