The correct answer is A:
used to
. Here is a detailed explanation:
- The phrase "used to" is used to talk about past habits or repeated actions that no longer happen in the present.
- In this sentence, the verb "tease" refers to a childhood activity, indicating that it no longer occurs in the present.
- Therefore, the correct form to complete the sentence is "used to tease each other during childhood."
- Let's break down the other options and explain why they are incorrect:
B: need to- "Need to" expresses necessity or obligation, which does not fit in the context of the sentence.
- The sentence is not discussing a current or future requirement to tease each other during childhood.
C: should- "Should" expresses advice or recommendation, which is not suitable in this sentence.
- The sentence is not discussing what is morally or ethically right to do during childhood.
D: will- "Will" expresses future tense, indicating that the action of teasing each other will happen in the future.
- However, the sentence is discussing a past action that no longer occurs in the present.
To summarize, the correct answer is A:
used to
. It accurately conveys the idea that teasing each other during childhood was a past habit or repeated action that no longer happens in the present.