He will be discharged . . . . . . . . a week. A. after B. before C. from D. since

The correct answer is: after.

The word “after” is used to indicate a time that comes after another time. In this case, the speaker is saying that the person will be discharged after a week. This means that the person will be discharged one week after the current time.

The other options are incorrect because they do not indicate a time that comes after another time. The word “before” is used to indicate a time that comes before another time. The word “from” is used to indicate a starting point in time. The word “since” is used to indicate a time that has passed since a particular event.

Here are some examples of how the word “after” can be used in a sentence:

• I will see you after work.
• The meeting will start after lunch.
• The party will end after midnight.

I hope this helps!