Question

I wrote __ my father a letter __ last week preposition

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Answer 1

Answer:

The correct answer is to, in.

Explanation:

The complete sentence will look like-

I wrote to my father a letter in last week.

In this statement, the speaker is telling that he wrote a letter to his father in the last week.

This makes correct grammatical sense and justifies the use of prepositions.

So, to, in are the appropriate answers.