16．It was not until then that they realized their son had addiction to computer games and often skipped school．
Not until thendidtheyrealizethat their son wasaddictedtocomputer games and often skipped school．

分析 直到那時他們才意識到他們的兒子沉溺于電腦游戲且時常逃學．

解答 答案：did； realize； addicted to 考查句型轉(zhuǎn)換．原句是強調(diào)句，同義句則是倒裝句，not until放在句首時要用倒裝句，還有：have addiction to與be addicted to意為相同．

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，就能達到異曲同工之妙．"句型轉(zhuǎn)換"題是用來考查學生對句子結(jié)構(gòu)變化所掌握的程度．

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