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This we went to the dormitory

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This we went to the dormitory
A. done B. did C. being done D. had been done.
为什么选A,又是什么主格什么的吗?请说下考点.
This____, we went to the dormitory.
首先,后面是个完整句,逗号不能连接两个句子,所以前面的this __,只能是状语,所以排除B和D.
根据句子时态,是过去时,所以只能选A,