By the beginning of this century,most of the tigers here _ out. A、die B、died C、had died

题目

By the beginning of this century,most of the tigers here _ out. A、die B、died C、had died
请问选哪个?为什么?

答案

By the beginning of this century,most of the tigers here _ out.（C）
A、die B、died C、had died
by 加时间作状语,句子一般用完成时,又因为是本世纪开头已经过去了,所以用过去的过去,即过去完成时.表示：到本世纪初,这儿大多数的老虎都消亡了.