单选题
On weekends, people are queuing in the supermarket to______for there are only a few cashes.
【正确答案】
D
【答案解析】解析：动词词组辨析。根据语境in the supermarket可知空格处的词组应是“结账”的意思。check on“上班，核查，核对”；check up“调查，检查，清理”；check in“登记签到，归还登记借出去的东西”；check out“结账，办结账手续”。故答案为D。