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The sentence which best uses prepositions is the fourth one, "When will you arrive at the opening gate?"
What is a preposition?
A preposition is usually a short word employed to make a connection between other words, that is, to establish a relationship between words. Examples of prepositions are:
- For
- On
- In
- At
As for each sentence, we may analyze them in the following manner:
- The first sentence places the preposition last in the structure, so we can eliminate it.
- The second sentence places the prepositions far away from the verb whose meaning they complete. It is incorrect.
- The third sentence uses the same preposition twice. It is incorrect.
- The only correct option is the fourth sentence, which correctly places the preposition "at" after the verb and before the object.
Learn more about prepositions here:
https://brainly.com/question/21537048