Fill in the blank with the most appropriate word.Where is Comrade A?He ___ tennis.

Answer: Option B

The sentence "He is playing tennis." uses the present continuous tense. The present continuous tense is formed by using the present tense of the verb "to be" (am, is, are) followed by the present participle of the main verb. It is used to describe actions that are happening at the time of speaking or around the current time.

In this sentence, "is playing" indicates that the action of playing tennis is currently happening or in progress.

In the other options:
Option A: plays (simple present) indicates a habitual or regular action, but it doesn't convey the current ongoing nature of the action.
Option C: played (simple past) is not appropriate for describing an action that is happening at the current moment.
Option D: has been playing (present perfect continuous) is not suitable for describing a specific ongoing action at the present moment.

The correct answer is Option B: is playing, which accurately conveys the current ongoing action of playing tennis.