I have already . . . . . . . . the Red Fort. A. saw B. seen C. seeing D. none

The correct answer is B. seen.

The verb “see” can be used in the simple past tense (saw) or the present perfect tense (seen). The simple past tense is used to talk about something that happened at a specific time in the past. The present perfect tense is

used to talk about something that happened at an unspecified time in the past or that is still true in the present.

In this sentence, the speaker is talking about something that happened in the past, so the simple past tense is not

appropriate. The present perfect tense is the correct tense to use because the speaker is saying that they have already seen the Red Fort, and this is still true in the present.

The other options are incorrect because they are not the correct tense to use in this sentence. Option A, saw, is the simple past tense. Option C, seeing, is the present participle. Option D, none, is not a verb.