说明原因 I wrote a letter to the car dealer,__what had happened

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：英语作业时间：2024/05/27 01:00:26

说明原因 I wrote a letter to the car dealer,__what had happened to my new car.
A.explaining
B.to explain
C.explains
D.explained

A
B 表目的时不能和主句用逗号分离
C 完全不对,单独做句子没主语,做附加成分不可以用一般时,也不可能加S
D 表示主语与后面动词explain是被动关系才用过去分词.

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