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

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

點(diǎn)評 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,同時注意不同的連詞的語義及用法區(qū)別.

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