6．---Argon，can I borrow your textbook？
---Sorry，not _____ you help make a note of what the teacher says．（　　）
A．unlessB．ifC．whenD．since

分析 -Argon，我可以借你的課本嗎？
-對(duì)不起，不行，除非你幫我記下老師說(shuō)的話．

解答 答案A．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(yǔ)從句．if"如果"，引導(dǎo)條件狀語(yǔ)從句．when"在…時(shí)候"，引導(dǎo)時(shí)間狀語(yǔ)從句．since意思是"自從…以來(lái)"時(shí)，引導(dǎo)時(shí)間狀語(yǔ)從句；意思是"既然"時(shí)，引導(dǎo)原因狀語(yǔ)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C和D；再結(jié)合句子所表達(dá)的意思"不行，除非你幫我記下老師說(shuō)的話"可知答案選A．本句中的not相當(dāng)于I will not lend you my textbook．

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(yǔ)義及用法區(qū)別．

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