Select the most appropriate option to improve the bold part of the sentence.
We waited for him since two hours.
Show answer & explanation
Correct answer: D
Explanation
The original sentence uses "since," which is grammatically incorrect when referring to duration of time.
For is used to describe a duration or period of time (e.g., for two hours, for five days, for a long time).
Since is used to refer to a specific starting point in time (e.g., since 2 PM, since Monday, since 2010).
Context: Because "two hours" is a length of time, "for" is the appropriate preposition to indicate how long the waiting lasted.
Therefore, the correct option to improve the bold part of the sentence is “for two hours”.