题目内容
18．I was writng a diary when my friend came to my house．（用while改写句子）While Iwas writng a diary，my friend came to my house．
分析 --当我的朋友来我家时我正在写日记．
--当我正在写日记时，我的朋友来我家．
解答 答案：While I．考查同义句．when和while都可以引导时间状语从句．when说明从句的动作和主句的动作可以是同时，也可以是先后发生．while 则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生．当when用while代替时，主从句位置要互换．因此答案是While I．
点评 同义句转换最基本的是要保持原意不变，在理解语境的基础上，抓住关键单词或词组，运用相同词意的单词或词组完成试题．
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