behind is correct in your sentence.
Quote:
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is it right that "after" refers to time while "behind" is related to space?
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I'd say: not quite.
Examples for
behind relating to time:
The bus was 20 minutes
behind time. (the bus was late)
(also: He is completely behind the times (He is old-fashioned))
Example for
after relating to location:
Our house is the next house
after the library.
Hope that helps
Snowcake