In ancient times, dogs were mainly ______helping people hunt( 打獵) .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
考查詞語(yǔ)辨析。be bad for“對(duì)…有害”；  be used to do“過(guò)去常常做…”  be used for doing “被用來(lái)干…” be good at doing“擅長(zhǎng)干…”句意為“在古代，狗主要用來(lái)幫人們打獵�，F(xiàn)在，它們更有用—能幫助盲人，搜尋壞蛋…”故選C。
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