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SAT一道语法题The crowds that flocked to the World's Fair in Chica

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SAT一道语法题
The crowds that flocked to the World's Fair in Chicago in 1893 were larger and more enthusiastic than the crowds at the World's Fair in Paris had been a few years earlier.
答案是这句话不变.这句中had been是什么成分?
谓语动词怎么能是flock?那是从句里面的,结构就是:The crowds (...) were larger and more enthusiastic than the crowds (...) had been...
为了保证比较前后结构对等,所以用了had been