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

A．

must

B．

can

C．

have to

D．

need

分析根據最近的研究，如果司機足夠小心的話，大部分交通事故都有可能被阻止．

解答答案B．must必須；can能夠，可能；have to不得不；need需要．這里使用can表示"（理論上或是邏輯判斷上的）可能"．根據句子所表達的意思可知答案選B．

點評本題考查情態動詞的用法．情態動詞表示說話人對某一動作或狀態的態度，所以在做題時應該把握好說話人的情感態度．can表示可能（理論上或是邏輯判斷上）．
如：The temperature can fall to-60℃，that is 60℃below freezing．氣溫可降至-60℃，也就是零下60℃． He can't（couldn't） have enough money for a new car．他不可能有足夠的錢買新車． You mustn't smoke while you're walking around in the wood．You could start a fire．在林子里走時勿吸煙，那樣可能會引起火災．

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