It took me a long time before I was able to fully appreciate what they for me.A. had done

发布时间：2020-08-16 20:18:08

It took me a long time before I was able to fully appreciate what they      for me.
A. had done
B. did
C. would do
D. were doing

网友回答

(答案→)A. had done
B. did
C. would do
D. were doing
解析：考查时态。从句的动作发生在谓语动词之前，题中谓语动词为took，“过去的过去”应用过去完成时态。故选A。
以上问题属网友观点，不代表本站立场，仅供参考！