What is a preposition?

What is the preposition in this sentence?
"Sally read her book in the living room."

7 answers

http://www.chompchomp.com/terms/preposition.htm
her
Sally has been reading that book ______ she arrived
Tell me the answer of this preposition
for
The correct answer is in look it up
tell me the answer to what is the preposition in this sentence sally read her book
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