Question

They have been playing _ _ _ _ three o'clock.

• A. for
• B. since
• C. by
• D. at

Hint:

Use \(since\) for starting point of time and \(for\) for duration.

Answer 1

The Correct Option is B

Concept:
We use: \[ since \] for a point of time. We use: \[ for \] for a period of time.

Step 1: Identify the time expression. The phrase is \[ \text{three o'clock} \] This is a point of time.

Step 2: Choose between for and since. For a point of time, we use \[ since \] So the sentence becomes: \[ \text{They have been playing since three o'clock.} \]

Step 3: Final answer. \[ \boxed{\text{since}} \]