Question

Fill in the gap in the following sentence using the correct preposition:
The project has been in development _______ last March, and we expect to complete it soon.

• A. since
• B. for
• C. during
• D. at

Hint:

Use “since” for a starting point in time and “for” for a duration.

Answer 1

The Correct Option is A

Concept: Use {since} with a specific point in time and present perfect tense.
Step 1: Identify tense.
\[ {“has been in development”} \Rightarrow {present perfect} \]
Step 2: Use correct preposition.

• since → used with a starting point (e.g., last March) \checkmark
• for → used with duration (e.g., 2 months) $\times$
• during → used for a period, not starting point $\times$
• at → specific time, not duration $\times$

Hence, the correct answer is since.