17．There will be no going back_____our decision is made．（　�。�
A．onceB．unlessC．untilD．before

分析 一旦我們做出決定，就不能再回頭了．

解答 答案A．once意思是"一旦，如果"時，引導(dǎo)條件狀語從句；unless"除非"，在意義上相當(dāng)于if…not，因此在有些場合中unless與if…not可互換使用，引導(dǎo)條件狀語從句；until"直到"，引導(dǎo)時間狀語從句； before"在…之前"，引導(dǎo)時間狀語從句．分析可知前后兩句話的關(guān)系是邏輯上的條件關(guān)系，可排除C和D兩項(xiàng)；再根據(jù)句子所表達(dá)的意思可排除B項(xiàng)，故答案選A．此題C項(xiàng)干擾性比較強(qiáng)，有同學(xué)會把它看作是"not…until…"句型，但是翻譯一下句子，會發(fā)現(xiàn)句子的意思不通順，因此C不正確．

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，同時注意不同的連詞的語義及用法區(qū)別．

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