Because he hadn't received his son's letter.John became worried．Nothavingreceived his son's letter.John became worried．题目和参考答案——青夏教育精英家教网——

题目内容

18．Because he hadn't received his son's letter，John became worried．
Nothavingreceived his son's letter，John became worried．

分析因为约翰没有收到他儿子的信，他变得很焦虑．

解答答案：Not having received 考查句型转换．原名中是由because引导的原因状语从句，同义句中则变成现在分词的否定完成式Not having received his son's letter作原因状语，与because引导的原因状语从句意思相同．

点评同义句型转换，是把意思相同或相近的句子用不同的词汇、短语及句型表示出来．同义句的相互转换除了考查主动句与被动句，复合句与简单句之间的转换，直接引语变间接引语外，还有一些词或短语的替换，仅仅通过替换几个词或短语，而使句子意思不变，就能达到异曲同工之妙．"句型转换"题是用来考查学生对句子结构变化所掌握的程度．

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