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3.These drawings have been ruined completely,because they are exposed to the air too long.
Exposed to the air for long,these drawings have been completely ruined.

分析 这些图画彻底地毁了,因为它们暴露于空气中太长时间.

解答 答案:Exposed to 考查句型转换.原句中的原因状语从句because they are exposed to the air too long转换成同义句中的过去分词短语exposed to the air for long作原因状语.

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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