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Sat 真题上的一道题

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Sat 真题上的一道题
Recently,fast-food restaurants have responded to criticisim that their food offerings are unhealthy to their menus items that are lower in fat and calories and smaller in portion size.
A,by adding
B.thereby adding
选A
把句子给简化,得到restaurants have responded to criticisim to their menus something
显然应该选by doing,因为respond to sth. by doing sth.
thereby有种所以的意味在里面,完全不合适.