Answer:
D
Explanation:
The definition of a shift in verb tense is: Tense shifts happen when writers accidentally switch from one tense to another in the same sentence, paragraph, story, or essay. Sometimes a shift is necessary, but accidental shifts happens when writers become distracted.
The reason is because the sentence should say..
When students ask question is class, teachers will answer them clearly.
The problem is that in the second part of the sentence it is saying the teacher answered the question, but in the first part it did not say a student asked the teacher a question.
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