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To keep safe, drivers aren¡¯t supposed to drink before driving.
A. aren¡¯t willing to B. shouldn¡¯t C. aren¡¯t sure to D. don¡¯t have to
B ¡¾½âÎö¡¿ ¾äÒ⡰ΪÁ˱£³Ö°²È«£¬Ë¾»úÔÚ¿ª³µÇ°²»Ó¦¸ÃºÈ¾Æ¡±¡£A.²»Ô¸Ò⣻B.²»Ó¦¸Ã£»C.²»È·¶¨£»D.²»±Ø¡£be not supposed to do²»Ó¦¸Ã£¬¹ÊÑ¡B¡£
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