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8．A1l the candidates are required to be at the Conference Hall at 2：00pm________ otherwise informed．（　　）

A．

unless

B．

C．

while

D．

though

分析所有的候選人都必須在下午2：00到達會議室，除非另有通知．

解答答案A．unless"除非"，在意義上相當于if…not，因此在有些場合中unless與if…not可互換使用，引導條件狀語從句．if"如果"，引導條件狀語從句；while意思是"當…時"，引導時間狀語從句，意思是"盡管，雖然"時，引導讓步狀語從句；though"盡管，雖然"，引導讓步狀語從句．通過分析可知前后兩個句子應該是邏輯上的條件關系，可排除C和D兩項．根據句子所表達的意思"除非另有通知"，也就是說"如果不另有通知"的意思，故可排除B，答案選A．

點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關系，再確定相應的連詞，同時注意不同的連詞的語義及用法區別．本題尤其要注意區分unless和if的用法．unless在意義上相當于if…not，因此在有些場合中unless與if…not可互換使用．如：Unless I am mistaken，I've seen that man before．=If I am not mistaken，I've seen that man before．如果我沒搞錯，我以前見過那個人．

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