题目内容
12．-Has your brother completed this design？-Not yet．Hewas working （work） on it last night．
分析 --你的哥哥已经完成这项设计了吗？
--还没有，他昨天晚上一直在做．
解答 答案：was working．
根据时间状语last night结合语境"他昨天晚上一直在做．"，判断设空处的动作在过去某个时间段内正在进行着，且动作在一段时间内持续进行，所以用过去进行时，过去进行时的构成是：主语+was/were+动词的现在分词，故答案为：was working
点评 本题考查用所给单词的适当形式填空，首先要根据语境明确句意，然后再根据相关语法对所给单词在形式上做出正确的变化．
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