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