20．-Write down your uncle's e-mail address，______ you'll forget it．
-All right，Mom．（　　）
A．andB．orC．butD．so

分析 --把你叔叔的電子郵箱地址記下來，否則你會忘記的．
--好的，媽媽．

解答 答案：B；
根據(jù)語境以及上下文，本題考查的是連詞的用法．根據(jù)設空處前后句子可以推斷句意是：把你叔叔的電子郵箱地址記下來，否則你會忘記的．句型"祈使句+or+陳述句"，表示在以祈使句為條件下的相反假設，or意為"否則，要不然"，故選B．

點評 比較和分析選項中連詞的不同含義及其用法是解答該題的關鍵；還要根據(jù)句中信息正確推測該句句意，進而作出解答．

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