Question

Find out the correct preposition.
She has been working on it _ _ _ _ _ _ last week.

• A. since
• B. on
• C. for
• D. from

Hint:

Use \textit{since} with a specific starting point in time and \textit{for} with a duration (e.g., since Monday, for two weeks).

Answer 1

The Correct Option is A

To determine the correct preposition for the sentence "She has been working on it _ _ _ _ _ _ last week," we need to understand the usage of each preposition provided in the options.

1. Since: This preposition is used to indicate the starting point of a period in time. Specifically, it is employed when referring to a point in the past from which an action has continued up to the present time. The phrase "since last week" implies an action that started last week and is still ongoing.
2. On: This preposition is generally used to specify days and dates, such as "on Monday" or "on the 5th of May." It is not suitable here, as the sentence needs a preposition that indicates a period starting in the past.
3. For: This is used to indicate a period of time and is typically followed by a duration, such as "for three days" or "for a week." However, it does not specify the starting point of the time period, making it unsuitable for this sentence.
4. From: This preposition is used to indicate the point in time at which something begins, such as "from 9 to 5." It would require an ending point to complete the phrase, which is not provided in the sentence.

Based on the explanations above, the most appropriate preposition is since, because it introduces the starting point of the activity relative to a specific time in the past, "last week." Using "since" correctly implies that the action has been ongoing from last week up to the present.

Therefore, the complete sentence should read: "She has been working on it since last week."