题目内容
20．The man behind your mother must be yourelder （old） brother．分析 你妈妈后面的那个男人一定是你哥哥．
解答 答案：elder 考查单词填空．根据句意你妈妈后面的那个男人一定是你哥哥，要用old的比较级：elder/older 这两个词均是old的比较级，在用法上有所区别．elder本身也是形容词．elder表示"前辈的"、"年纪较长的"，仅用于同一家庭成员的比较elder．故答案是elder．
点评 解答此题的关键是根据语境推测要填内容表达的含义，然后能理解各选项内容，有时可能没有必要细细区分每个单词的含义，仅根据句子语气就可以判断出正确答案．
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