18．You can't complain of being lonely         you don't make any effort to communicate with others．（　�。�
A．whenB．untilC．unlessD．once

分析 既然你不愿和別人交流，你就不能抱怨孤獨(dú)．

解答 答案：A 
句意表達(dá)的是因果關(guān)系；until直到，unless除非，once一旦；when除了表示時(shí)間外，還有既然的含義．故選A．

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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