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

分析 這部戲劇結(jié)局一直是個(gè)謎，因?yàn)橹谱魅讼虢o觀眾一個(gè)驚喜．

解答 答案：B．
本句中劇情是個(gè)謎的原因在于制作人想給觀眾一個(gè)驚喜，前后存在邏輯上的因果關(guān)系，所以用because來引導(dǎo)一個(gè)原因狀語從句；故選B．

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(shí)注意不同的連詞的語義及用法區(qū)別

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