Question

It has not rained at all__ two weeks

Answer 1

Answer: It has not rained at all *in* two weeks.

Answer 2

It has not rained at all in two weeks.

Detailed answer

It is the most appropriate word to be used at this moment as it provides a special meaning to the sentence.

• The word acts as a pronoun, adjective, adverb, and noun.
• It is the most appropriate preposition to be used in the given sentence.
• The sentence is now a grammatically appropriate sentence.
• Any other preposition would make the sentence either meaningless or grammatically incorrect.