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?yàn)樗鼈儽┞队诳諝庵刑L時(shí)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(diǎn)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(dòng)句與被動(dòng)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(gè)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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