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My mother goes shopping,______I must look after my little brother.
A.soB.becauseC.andD.but
A

试题分析:because 是从属连词,接表示直接原因的从句,一般放在主句的后面,也可放在主句前面,它表示的语气最强,在回答why的问句时,必须用because。as 是从属连词,说明一般的因果关系,语气比because弱,说明比较明显的原因,它引导的从句通常放在句首,有时也可放在句末。And是和的意思,表示并列或顺承;but表示转折,根据语境可知选择A.
点评:because只能放在句子中间,在它之前的是结果,后面的是原因. so做所以解释时也是放在句子中间,在它之前的是原因,后面的是结果.
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