The teacher is ____ a meeting.(have)

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The teacher is ____ a meeting.(have)
The teacher is ____ a meeting.(have)

The teacher is ____ a meeting.(have)
having

having,现在进行时。系动词后面要么跟名词要么跟被动语态,要么跟动词ing,被动形式时动词跟主语是被动关系,而这里老师在开会,主语老师,动词,have,主动关系,只能用ing形式。