now是表示现在这个时刻，用现在进行时，所以是are having a class meeting
yesterday表示昨天，是一整天的时间，用一般过去时，所以用had a class meeting
而如果是表示昨天的某个时刻，则可以用过去进行时（were having），例如昨天9点钟学生们在开班会：The students were having a class meeting at 9:00 yesterday.
The students are having a class meeting now. (用yesterday改写)
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