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 考查情態(tài)動(dòng)詞。句意：根抿最近的研究，如果司機(jī)足夠小心的話，大部分交通事故是可以避免的。must必須；can， 能夠；可能；have to不得不；need需要。這里使用can表示客觀的可能性。所以選B。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練25 情態(tài)動(dòng)詞和虛擬語氣

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