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 考查情態動詞。句意：根抿最近的研究，如果司機足夠小心的話，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 > 訓練25 情態動詞和虛擬語氣
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