To find the correct preposition for the sentence "He will qualify _ _ _ _ _ _ a year of entering the campus," we need to understand the context and the typical use of prepositions in English grammar.
- The sentence indicates a time frame in which an action (qualifying) is expected to occur after another event (entering the campus).
- Let's examine the options:
- from: This preposition typically indicates the starting point of a time or distance and is not suitable for indicating a time limit within which something is expected to happen.
- since: This is used to refer to a point in the past from which up to now something has been true, and it is not appropriate for referring to a future time limit or duration.
- with: This preposition is usually used to indicate association or accompaniment and does not fit logically in the given sentence context.
- within: This preposition indicates a period of time, meaning 'no later than' or 'inside of the time limit specified.' It is used to express a deadline or time limit within which an event or action is expected to happen.
- The correct choice for indicating something that will happen inside the span of a year after entering the campus is "within."
Therefore, the sentence, when correctly filled, reads: "He will qualify within a year of entering the campus." This indicates that the qualification will occur at some point not later than one year after the person enters the campus.