一道SAT改错Having completed a course in art appreciation, Mauree

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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?

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

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