connection must be valid and open to rollback tranaction怎么处理

connection must be valid and open to rollback tranaction怎么处理

connection must be valid and open to rollback tranaction
连接必须是有效的和开放的回滚事务

搜一下：connection must be valid and open to rollback tranaction怎么处理

谢谢解答

A. lived(答案→)B. is livingC. liveD. was living解析：考查动词的用法。依据从句“because her parents are both very busy this month”的时态为一般现在时可推断主句的时态也应是一般现在的时态，故保留B（现在进行时）和C（一般现在时）项；“the girl”是第三人称单数，所以谓语动词也应是第三人称单数，故C项不正确，故选B。