题目内容

9．The play has remained a mystery ________ the producer wants to surprise the audience．（　　）
A．althoughB．becauseC．unlessD．until

分析 这部戏剧结局一直是个谜，因为制作人想给观众一个惊喜．

解答 答案：B．
本句中剧情是个谜的原因在于制作人想给观众一个惊喜，前后存在逻辑上的因果关系，所以用because来引导一个原因状语从句；故选B．

点评 本题考查从属连词的用法．连词的用法辨析，要注意分析主从句之间的逻辑关系，再确定相应的连词，同时注意不同的连词的语义及用法区别

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