题目内容
4．My old father began to study computer at the age of sixty______ he might keep up with times．（ ）| A． | if | B． | so that | C． | although | D． | unless |
分析 为了跟上时代，我的老父亲在六十岁时开始学习电脑．
解答 答案B．
if"如果"，引导条件状语从句．so that作"为了，以便"讲时，引导目的状语从句；作"结果"讲时，引导结果状语从句．although"尽管，虽然"，引导让步状语从句．unless"除非，如果不"，在意义上相当于if…not，因此在有些场合中unless与if…not可互换使用，引导条件状语从句．分析可知前后两句话之间是逻辑上的"目的"关系，再结合句子所表达的意思可知答案选B．
点评 本题考查从属连词的用法．连词的用法辨析，要注意分析主从句之间的逻辑关系，再确定相应的连词，同时注意不同的连词的语义及用法区别．
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