20．--Do the factory board members meet every Monday morning？
--Yes，________ there is nothing important to deal with．（　�。�
A．sinceB．ifC．unlessD．once

分析 --這家工廠董事會(huì)的成員每周一早晨都開會(huì)嗎？
--是的．除非沒有重要的事情討論，否則每周一早晨都開會(huì)．

解答 答案：C．
分析上下兩個(gè)句子的意思可知，劃線處后面的句子為一個(gè)特例，除此之外都開會(huì)，所以用unless表示"除…之外"；故選C．

點(diǎn)評(píng) 本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關(guān)系，再確定相應(yīng)的連詞，同時(shí)注意不同的連詞的語義及用法區(qū)別．

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