12．The issuebeing discussed （discuss） at the meeting now is of great importance．

分析 此刻會(huì)議上正在討論的問(wèn)題很重要．

解答 答案是being discussed．本題考查非謂語(yǔ)動(dòng)詞做定語(yǔ)，題干中需要的是the issue的定語(yǔ)，故用非謂語(yǔ)的形式做定語(yǔ)：動(dòng)詞不定式作定語(yǔ)表示將來(lái)；現(xiàn)在分詞表示進(jìn)行；過(guò)去分詞表示被動(dòng)和完成；由題干中的時(shí)間狀語(yǔ)now判斷用現(xiàn)在分詞做定語(yǔ)；此外the issue和discuss 之間是被動(dòng)關(guān)系，故需要用現(xiàn)在分詞的被動(dòng)語(yǔ)態(tài)，因此答案是being discussed．

點(diǎn)評(píng) 本題是要求用所給詞的適當(dāng)形式填空，解題時(shí)首先根據(jù)句子的結(jié)構(gòu)考慮句中需要的詞性；其次，關(guān)注所選詞的形式的變化：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．如果是名詞關(guān)注單數(shù)和復(fù)數(shù)的選用等．

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