Rita and Anna have finished their homework ? A. have they B. haven’t they C. didn’t they

问题补充：

Rita and Anna have finished their homework, ?

A. have they B. haven’t they C. didn’t they

答案：

解析：本题为反义疑问句，前句是肯定的，后句用否定的结构，本题的否定结构为haven’t，故本题选B。