19．The bellindicating（indicate） the end of the period rang，interrupting our heated discussion．

分析 表明這一節(jié)課結(jié)束的鈴聲響了，打斷了我們熱烈的討論．

解答 答案是indicating．本題考查現(xiàn)在分詞做定語；名詞the bell后面的indicate the end of the period充當(dāng)?shù)氖嵌ㄕZ，故用非謂語動(dòng)詞的適當(dāng)形式；動(dòng)詞不定式做定語常常表示"將來"；現(xiàn)在分詞做定語表示與被修飾的名詞之間是"主動(dòng)、進(jìn)行"的關(guān)系；過去分詞做定語表示分詞與被修飾的名詞之間是"被動(dòng)或完成"的關(guān)系；本題中indicate與the bell之間是主動(dòng)關(guān)系，故用Indicating．

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動(dòng)詞還是非謂語動(dòng)詞；其次，如果是謂語動(dòng)詞關(guān)注時(shí)態(tài)、語態(tài)和數(shù)的變化；如果是非謂語動(dòng)詞要聯(lián)系非謂語的基本用法判斷非謂語的形式．

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