一个公司有几个ceo:Come in！

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如图,经过线段BC与一点A,可以做______个平行四边形.(这三个点都是顶点)
A .

B ______________________ C

3个

Come in! Come in ！.............. Come in ！.............. Come in ！.............. COME IN COME IN!!!! COME IN Come in！ Come in ！.............. Come in ！..............