the teacher didn't sit down until he saw every student already had a chair____A to sit B to sit down C to sit at D to sit on 原因是什么呢 其他选择为什么不能选

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the teacher didn't sit down until he saw every student already had a chair____A to sit B to sit down C to sit at D to sit on 原因是什么呢 其他选择为什么不能选
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the teacher didn't sit down until he saw every student already had a chair____A to sit B to sit down C to sit at D to sit on 原因是什么呢 其他选择为什么不能选
the teacher didn't sit down until he saw every student already had a chair____
A to sit B to sit down C to sit at D to sit on
原因是什么呢 其他选择为什么不能选

the teacher didn't sit down until he saw every student already had a chair____A to sit B to sit down C to sit at D to sit on 原因是什么呢 其他选择为什么不能选
have a chair to sit on.这里考的是介词.sit on a chair.用on才对.