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为何选before而不选after有一道题目:Itseemedonlysecondstheboyfinishedhishomework.AwhenBifCafterDbefore答案选before,实在区分不了before和after了,怎么理解呢?

题目详情
为何选before而不选after
有一道题目:It seemed only seconds_______ the boy finished his homework.
A when B if C after D before
答案选before,实在区分不了before和after了,怎么理解呢?
▼优质解答
答案和解析
it 指时间 结构为 It was +some time before...
it will be +some time before
seemed 相当于was
本句意为看来只用了几秒种这男孩就完成了他的作业