You should not . . . . . . . . back with your teacher. A. talk B. talks C. had talked D. talked

The correct answer is: You should not talk back with your teacher.

The other options are incorrect because:

• Option B, talks, is in the present tense. This is not the correct tense to use in this sentence, because the speaker is giving advice about what should not be done.
• Option C, had talked, is in the past perfect tense. This tense is used to talk about something that happened before another event in the past. In this sentence, the speaker is not talking about something that happened before another event in the past.
• Option D, talked, is in the simple past tense. This tense is used to talk about something that happened at a specific time in the past. In this sentence, the speaker is not talking about something that happened at a specific time in the past.

The sentence “You should not talk back with your teacher” means that you should not argue with your teacher or answer them in a disrespectful way. It is important to be respectful to your teachers, even if you disagree with them.