2．Facing a beggar，I may feel this poor person needs help，and the need will not be met _____ I put my hand in my pocket now．（　　）
A．sinceB．in caseC．unlessD．while

分析 面對(duì)一個(gè)乞丐，我會(huì)覺得這個(gè)可憐人需要幫助，而且這種需要不會(huì)得到滿足，除非我現(xiàn)在就把手放到口袋里（掏錢）．

解答 答案：C
句意表達(dá)的是條件；since因?yàn)�，in case以防萬一，unless除非，while然而，卻；unless相當(dāng)于if not，和句中的the need will not be met構(gòu)成雙重否定，表達(dá)肯定的意思．故選C．

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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