Question

The weather has been getting warmer ______ several years.
A) since
B) toward
C) for
D) along
E) through

Answer 1

Thank you for asking the question!
The correct answer is A. The weather has been getting warmer since several years.  Since is used when the specific time is not mentioned. So when the time span is not exact then since is used. On the other hand For is used when the specific tie is given.
Hope it helps.