–Were you at school when he came to see you?
–Yes, I ______ a math class.
A. was having               B. had                  C. am having
A
考察時(shí)態(tài)。本題的have不是表示擁有的意思,而是一個(gè)固定詞組have s class上課；所以可以有進(jìn)行時(shí)態(tài)。句意：—當(dāng)他來(lái)看你的時(shí)候，你在學(xué)校嗎？—是的。我正在上數(shù)學(xué)課。
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