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 這些圖畫徹底地毀了，因為它們暴露于空氣中太長時間．

解答 答案：Exposed to 考查句型轉(zhuǎn)換．原句中的原因狀語從句because they are exposed to the air too long轉(zhuǎn)換成同義句中的過去分詞短語exposed to the air for long作原因狀語．

點評 同義句型轉(zhuǎn)換，是把意思相同或相近的句子用不同的詞匯、短語及句型表示出來．同義句的相互轉(zhuǎn)換除了考查主動句與被動句，復(fù)合句與簡單句之間的轉(zhuǎn)換，直接引語變間接引語外，還有一些詞或短語的替換，僅僅通過替換幾個詞或短語，而使句子意思不變，就能達(dá)到異曲同工之妙．"句型轉(zhuǎn)換"題是用來考查學(xué)生對句子結(jié)構(gòu)變化所掌握的程度．

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