15．When the teacher came into the classroom，the studentswere talking（talk） freely．

分析 當老師進入教室的時候，學生們在自由談話．

解答 答案：were talking．
根據(jù)when引導的時間狀語從句用了一般過去時，判斷設空處的動作在過去某個時刻，即"老師進入教室時"正在進行著，且動作在一段時間內(nèi)持續(xù)進行，所以用過去進行時，過去進行時的構成是：主語+was/were+動詞的現(xiàn)在分詞，主語是復數(shù)名詞，所以be動詞用were，故填were talking．

點評 本題考查用所給單詞的適當形式填空，首先要根據(jù)語境明確句意，然后再根據(jù)相關語法對所給單詞在形式上做出正確的變化．

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