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

分析 所有的候選人都必須在下午2：00到達(dá)會(huì)議室，除非另有通知．

解答 答案A．unless"除非"，在意義上相當(dāng)于if…not，因此在有些場(chǎng)合中unless與if…not可互換使用，引導(dǎo)條件狀語從句．if"如果"，引導(dǎo)條件狀語從句；while意思是"當(dāng)…時(shí)"，引導(dǎo)時(shí)間狀語從句，意思是"盡管，雖然"時(shí)，引導(dǎo)讓步狀語從句；though"盡管，雖然"，引導(dǎo)讓步狀語從句．通過分析可知前后兩個(gè)句子應(yīng)該是邏輯上的條件關(guān)系，可排除C和D兩項(xiàng)．根據(jù)句子所表達(dá)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(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．本題尤其要注意區(qū)分unless和if的用法．unless在意義上相當(dāng)于if…not，因此在有些場(chǎng)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(cuò)，我以前見過那個(gè)人．

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