- 试题详情及答案解析
- Only after the teacher explained it to me a second time _____ the question.
| A．did I understand | B．I had understood |
| C．had I understood | D．I did understand |
- 答案：A
- 试题分析：考查倒装结构。Only引导的条件状语从句要用倒装，explained是用的一般过去时，而我明白是发生在解释之后，所以用一般过去时就行，过去完成时在这行不通。句意：老师向我解释了之后我才明白了这个问题。故选A。
考点：考查倒装结构。