12．We are planning to go camping ________ it doesn't rain tomorrow．（　�。�
A．thoughB．ifC．unlessD．while

分析 如果明天不下雨我們打算去露營．

解答 答案：B
though盡管；if如果；unless除非；while當(dāng)…時(shí)候；句意表達(dá)的是條件，且從句是否定，要用if來連接，unless表達(dá)否定，相當(dāng)于if not，故選B．

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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