19．Why do some rich people steal things ____ they could easily afford to buy them？（　　）
A．unlessB．beforeC．ifD．when

分析 一些有錢人明明可以輕松掏錢買東西，為什么他們偏偏要偷呢？

解答 答案：D
題干中they could easily afford to buy them使用了情態(tài)動詞could，這是一種特殊的虛擬，用來表達(dá)遺憾，意思是：本來…卻…．when引導(dǎo)狀語從句，表達(dá)對比的含義．故選D．

點(diǎn)評 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，要注意區(qū)分和掌握．

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