15．It was raining all day yesterday，completelyruining （ruin） his holiday．

分析 昨天下了一整天的雨，徹底地毀了他的假期．

解答 答案是ruining．句中已經(jīng)有了謂語(yǔ)動(dòng)詞was raining，所以ruin必須用非謂語(yǔ)的形式；由上下文的邏輯判斷，整天下雨的"結(jié)果"是毀了他的假期；英語(yǔ)中常常用現(xiàn)在分詞表示"順其自然的結(jié)果"，所以答案是ruining．

點(diǎn)評(píng) 本題是要求用所給動(dòng)詞的適當(dāng)形式填空，解題時(shí)首先考慮句中需要的是謂語(yǔ)動(dòng)詞還是非謂語(yǔ)動(dòng)詞；其次，如果是謂語(yǔ)動(dòng)詞關(guān)注時(shí)態(tài)、語(yǔ)態(tài)和數(shù)的變化；如果是非謂語(yǔ)動(dòng)詞要聯(lián)系非謂語(yǔ)的基本用法判斷非謂語(yǔ)的形式．

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