8．              you try to do something beyond what you have already mastered，you will never grow．（　　）
A．OnceB．IfC．UnlessD．Because

分析 如果你不盡力做超出你已經(jīng)掌握的事件，你永遠不會成長．

解答 答案是C．本題考查從屬連詞辨析．once一旦；if 如果；unless 除非；如果不；because因為；根據(jù)語境，"如果不"盡力做超出掌握的事，就沒有成長；故選C．

點評 就從屬連詞的解題，考生首先要理解各從屬連詞的含義，并理解各連詞所引導(dǎo)的從句的特殊用法；最后結(jié)合句子的結(jié)構(gòu)和語境做出符合語義、語法和邏輯常識的選擇．

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