By the beginning of this century,most of the tigers here _ o

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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?

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.

By the beginning of this century,most of the tigers here _ o 英语完形填空At the beginning of this century,medical scientists ma 英语翻译IntroductionSince the beginning of the twentieth century at the beginning of the last century怎么翻译 the beginning of (the 21st century)怎么读 Hollywood was just farmland at the beginning of last century This is the beginning of the garden The early 20s of this century, in the early part of the 19th century 和 at the beginning of at the beginning of this love . 英语翻译*1.by the dawn of the twentieth century,industrializatio Since the beginning of