20．A small car is big enough for a family of three          you need more space for baggage．（　�。�
A．onceB．in caseC．ifD．unless

分析 一部小車對(duì)于三口之家已經(jīng)足夠大了，除非你需要更多的空間來放行李．

解答 答案D．once"一旦"，引導(dǎo)時(shí)間狀語從句；in case"萬一"，引導(dǎo)條件狀語從句；if"如果"，引導(dǎo)條件狀語從句；unless"除非，如果不"，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．分析可知前后兩句話之間是邏輯上的"條件"關(guān)系，可排除A．再根據(jù)句子所表達(dá)的意思"除非你需要更多的空間來放行李"可知B和C項(xiàng)句意不通順，故答案選D．

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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