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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
C
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。
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