20．-My son is addicted to drugs．He isn't hopeless，is he？
-Yes，     he mends his ways and starts all over．（　�。�
A．ifB．whenC．even ifD．unless

分析 -我的兒子沉迷毒品．他還有希望，對(duì)嗎？-不，除非他痛改前非，重新做人．

解答 答案：D 句中反意疑問句陳述句部分用否定，回答中的yes要翻譯為不，意思是他沒希望了；后面表達(dá)的是肯定的意思，與前面的回答構(gòu)成轉(zhuǎn)折含義；unless相當(dāng)于if not，符合句意．故選D．

點(diǎn)評(píng) 從屬連詞是連詞的一種，用來引導(dǎo)名詞性從句和狀語從句．大致可分為三大類：that（無詞義，不做成分）if，whether （表達(dá)是否的意義，但不做句子成分）； 連接代詞：who，whom，whose，what，which，whatever，whoever，whichever（有詞義，在句子中可作主語、表語、賓語）；連接副詞：when，where，why，how，how many，how long，how far，however，whenever，wherever （有詞義，作從句的狀語）．學(xué)習(xí)時(shí)，要注意區(qū)分和掌握．

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