题目

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 答案：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。

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