lt's nine o'clock,and they _____ [have]classes.

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lt's nine o'clock,and they _____ [have]classes.
lt's nine o'clock,and they _____ [have]classes.

lt's nine o'clock,and they _____ [have]classes.
are having 有具体时间点现在进行时

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are having,现在进行时

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lt's nine o'clock,and they _____ [have]classes.﻿