1) Find the object of the preposition.
2) Ask yourself which other word in the sentence is related to this noun or pronoun by the preposition.
It prevented the Allies from knowing what the Soviets were up to
Answer:
He
Explanation:
I could only find one hope this helps ( it was HE)
The letter "g"
hope it helps!
I believe it is anecdotal.
I hope that helps ; )