Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.
A．before B．once C．until D．unless
B

試題分析：句意：壞習(xí)慣一旦形成，很難有時(shí)是不可能去掉的了。Before……以前；once一旦；until直到……才；unless除非。這里once后跟從句，從句是省略句，完整的是once they are formed，根據(jù)句意故選B。
點(diǎn)評(píng)：本題難度適中。判斷從句中用哪個(gè)連詞，需用記住連詞的用法，在句中的作用，連詞也是高考的熱點(diǎn)，需要考生平時(shí)多練習(xí)。需要考生會(huì)分析句子成分理解句意。
即學(xué)即練：I won't go to the party _______ I'm invited.
A. before   B. once         C. until        D. unless
解析：D。句意：除非我被邀請(qǐng)，否則我不會(huì)去參加晚會(huì)的。
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