题目内容
7．He failed the math exam again because the bellrang/had rung （ring） before he finished the rest half of the testing-paper．分析 他数学考试又不及格，因为在他完成剩下的一半的卷子前，下课铃就响了．
解答 正确答案：rang/had rung．划线处缺一个谓语，本句是由because引导的原因状语从句，描述的是发生在过去的事情，则句子可用一般过去时，即主语+did，则此处可填写rang．按照动作发生的先后顺序完成剩下的一半试卷动作发生在前，铃响又发生在完成试卷前，则也可用过去完成时，即主语+had+done，则可填写had rung．
点评 本题考查用所给单词的适当形式填空，基础题，根据题干准确判断时态是解题的关键．
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