The bridge dates ---250 years ago.此空能否填back \back to\from

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The bridge dates ---250 years ago.此空能否填back \back to\from
The bridge dates ---250 years ago.此空能否填back \back to\from

The bridge dates ---250 years ago.此空能否填back \back to\from
back to
from

back to

应该填from或者back to意思是那座大桥的期限应追溯到两百五十年前。

back to & from

应该填back to,这个词组就有从...开始追溯的意思