专升本考试

【单选题】Sally's score on the exam is the lowest in the class. She ______ harD、
A．should have studied
B．must have to study
C．must have studied
D．needn't have studied
网考网参考答案：A
网考网解析：
实际情况是莎莉成绩最差，那么说明她以前没认真学习。用“should+完成时态”表示过去应该做而没有做到的情况。must have to study, must不能与have to连用，两者重复；must have studied表示对过去情况的一种推测，与句意相反；needn't have studied表示没必要做而实际已经做了，与句意也不符合。因此判断A正确。 查看试题解析出处>>