In ancient times, dogs were mainly _________ helping people hunt(打猎)．Now they are more useful-they can help the blinds, search for the bad eggs,…A.bad forB.used toC.used forD.good at
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C解析考查词语辨析。be bad for“对…有害”；be used to do“过去常常做…”be used for doing “被用来干…”be good at doing“擅长干…”句意为“在古代，狗主要用来帮人们打猎。现在，它们更有用-能帮助盲人，搜寻坏蛋…”故选C。