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

分析 此刻會議上正在討論的問題很重要．

解答 答案是being discussed．本題考查非謂語動詞做定語，題干中需要的是the issue的定語，故用非謂語的形式做定語：動詞不定式作定語表示將來；現(xiàn)在分詞表示進(jìn)行；過去分詞表示被動和完成；由題干中的時間狀語now判斷用現(xiàn)在分詞做定語；此外the issue和discuss 之間是被動關(guān)系，故需要用現(xiàn)在分詞的被動語態(tài)，因此答案是being discussed．

點評 本題是要求用所給詞的適當(dāng)形式填空，解題時首先根據(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：如果是謂語動詞關(guān)注時態(tài)、語態(tài)和數(shù)的變化；如果是非謂語動詞要聯(lián)系非謂語的基本用法判斷非謂語的形式．如果是名詞關(guān)注單數(shù)和復(fù)數(shù)的選用等．

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