by specialScientists hope it will be finished ___ 2006.A by B at C in D for为什么选A by

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by special
Scientists hope it will be finished ___ 2006.
A by B at C in D for
为什么选A by

by 表示时间点之前
at表示在当时
in是在该年内

By 用于表达将来到。。。时候

by +年份，代表到哪年为止

by 2006 在2006之前

by specialScientists hope it will be finished ___ 2006.A by B at C in D for为什么选A by by by by by by by by by by by by by “by”这个词有几种解释?by by by by MTR和by story by,written by by used by by the