【题目】The twins, who _____ their homework, were allowed to play badminton in the yard.
A. will finish B. finish
C. have finished D. had finished
在线课程【答案】D
【解析】
考查时态。句意：做完作业的那对双胞胎获准在院子里打羽毛球。结合句意who _____ their homework中的动作先于主语谓语动词动作were allowed，也就是“过去的过去”，所以句子用过去完成时态，故选D。