Preposition Usage in the Sentence

The sentence "I wish I were experienced ---- the field of marketing" requires a preposition to complete the sentence.

The correct preposition to use in this sentence is "in."

Explanation:

The preposition "in" is used to indicate that someone has experience in a particular field or area of expertise. In this sentence, the speaker wishes that they had experience in the field of marketing.

The use of the preposition "on" would be incorrect in this sentence. While "on" can be used to indicate someone's knowledge or expertise on a particular topic, it is not the appropriate preposition to use when referring to experience in a field.

Similarly, the use of the preposition "at" would also be incorrect in this sentence. While "at" can be used to indicate a physical location, it is not the appropriate preposition to use when referring to experience in a field.

Conclusion

In conclusion, the correct preposition to use in the sentence "I wish I were experienced ---- the field of marketing" is "in." This preposition accurately conveys the speaker's desire for experience in a particular field.