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一道SAT改错Havingcompletedacourseinartappreciation,MaureenandIwereabletojudgethepaintingsintheMuseumofModernArtmorecriticalthanwehadbefore.请问后面怎么能用had?只见过前面是sth或者doing后面用had的前

题目详情
一道SAT改错
Having completed a course in art appreciation, Maureen and I were able to judge the paintings in the Museum of Modern Art more critical than we had before.
请问后面怎么能用had?
只见过前面是sth或者doing 后面用had的
前面是动词的话为什么还是had?
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答案和解析
这个是过去完成时省略过去分词的写法,完整的写法应该是:than we had been able to do so before,因为be able to 与前面主句的谓语动词重复,因此语法规定是可以省略的
这句应该错在critical,要用副词修饰动词judge,用critically