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Bob promises to join in the football match ________ he has to help his parents on the farm.
A.ifB.asC.unlessD.when
C

试题分析:if 如果,是否;as由于,作为;unless除非,如果不;when既然,当……时。如果他在农场上帮助他的父母,鲍勃许诺帮助参加这场足球比赛。故选C。
点评:连词在句子中主要起联系上下文的作用,他们之间的区别就是表示逻辑关系的不同,所以在解题时先要理解上下文含义,然后根据上下文逻辑关系选择合适的连词。连词的用法都比较多,语义之间还有交叉,熟记其基本应用规则,了解其区别,注意固定搭配对象,是做好此类题型的关键。
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