There was a considerable variety of opinion.
这里,a considerable variety of opinion 是: 一种可值得考虑的观点/意见/看法
a variety of 有两种意思:多种多样的…,一种…(特别是variety前面有修饰词/定语)
注意: opinion 是可数名词,不是
不可数名词there be 的句式是
倒装句,主语是:a considerable variety of opinion 单数概念,所以用was.
题外话: a variety of+ 可数名词复数形式,
谓语动词用复数; a variety of + 不可数名词/可数名词单数,谓语动词用单数。varieties of + 复数形式,谓语动词用复数。本回答被提问者采纳