There is a widespread belief in the United States and Western Europe that young people have a smaller commitment to work and a career than their parents and grandparents and that the source of the change lies in the collapse of the "work ethic."
a smaller commitment to work and a career than their parents and grandparents
less of a commitment to work and a career than their parents and grandparents
a smaller commitment to work and a career than that of their parents and grandparents
less of a commitment to work and a career than their parents and grandparents had
a lessening of the commitment to work and a career that their parents and grandparents had
[比较问题]
如果比较两边时态相同的话,than后面的have确实是可以省略的,但是年轻人和父母爷爷奶奶比,平行过去肯定爸爸妈妈那个时候是过去的情况,所以had是需要补充出来的[时态变了]
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