问题
选择题
--- Were you at school when he came to see you ?
---- Yes, I __________ a math class .
A. had B. was having C. am having
答案
答案：B
题目分析：句意：当他来看你的时候你在学校吗？是的， 我当时正在上一节数学课。根据上下句可知是过去进行时态，故选B。
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