Anumberofaudiencewerepresentintheregistrationcenterinthemorning,thenumberofwhomwasbepresentat是固定搭配吗?这里用“bepresentin"是否正确?到底是不是固定搭配哟，老师经常说bepresentat,beabsentfrom啊

Question

A number of audience were present in the registration center in the morning,the number of whom was
be present at是固定搭配吗?这里用“be present in" 是否正确?
到底是不是固定搭配哟，老师经常说be present at ,be absent from啊？

Answer 1

be present at 是固定搭配,
在这里前面和后面分开的
A number of audience were present, in the registration center是两个部分.不是be present in