I . . . . . . . . Sidra yesterday. A. have seen B. saw C. had seen D. seen

The correct answer is: B. saw

The verb “saw” is the simple past tense of the verb “to see.” It is used to describe an action that happened at a specific time in the past. In this case, the action is “seeing Sidra.”

The other options are incorrect because they do not agree with the tense of the sentence. “Have seen” is the present perfect tense, “had seen” is the past perfect tense, and “seen” is the past participle.

Here is a more detailed explanation of each option:

• A. have seen is the present perfect tense of the verb “to see.” It is used to describe an action that has happened at some point in the past and continues to happen in the present. In this case, the action is “seeing Sidra.” However, the sentence does not describe an action that continues to happen in the present. It describes an action that happened at a specific time in the past.
• B. saw is the simple past tense of the verb “to see.” It is used to describe an action that happened at a specific time in the past. In this case, the action is “seeing Sidra.” The sentence describes an action that happened at a specific time in the past, so “saw” is the correct verb tense.
• C. had seen is the past perfect tense of the verb “to see.” It is used to describe an action that happened before another action in the past. In this case, the sentence does not describe an action that happened before another action in the past. It describes an action that happened at a specific time in the past.
• D. seen is the past participle of the verb “to see.” It is used to form the perfect tenses and the passive voice. In this case, the sentence does not use the perfect tenses or the passive voice. It uses the simple past tense.

Therefore, the correct answer is: B. saw