题目内容
6．-Every student in our class was at the meeting except you．Why？-Sorry，sir．Ms Wangwas explaining （explain） a maths problem to me．
分析 -我们班的每一个学生除了你都在会上．为什么？
-对不起，先生．王老师在给我讲解一道数学难题．
解答 答案：was explaining
联系语境，根据Every student in our class was at the meeting except you可知此句运用了一般过去时，是对已经发生的事情进行询问，所以答语应该对在开会的时候正在进行的动作进行回答，强调在开会的时候正在做某事，应该用过去进行时，构成为：was/were+现在分词；这里主语为三单Ms Wang，所以用was，explain的现在分词为explaining，指在开会的时候王老师正在给我讲解一道数学难题．故填：was explaining
点评 此题考查时态的运用．做题时联系前后语境先确定出说话者的意图从而确定正确的时态，结合构成即可做出正确答案．
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