Robert toiled over his report for two years, slightly longer than it took Herman to write "Mobt Dick".
老师好,根据take sb sometime to..可以判断出这里的longer其实是a longer (time)吗?
It takes sb. long to do sth.
Sb.takes long to do sth.
Sth. takes sb. long.
最简单的理解是:把long 看作名词,等于 a long time;而longer 等于 a longer time。
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