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  3. Sally’s score on the exam is the lowest in the class. She______ hard.

Sally’s score on the exam is the lowest in the class. She______ hard.

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问题 Sally’s score on the exam is the lowest in the class. She______ hard.
选项 A、should have studied
B、must have to study
C、must have studied
D、needn’t have studied
答案A
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。B．“must have to study”，must不能与have to连用，两者重复。C“must have studied”表示对过去情况的一种推测，与句意相反。D．“needn’t have studied”表示没必要做而实际已经做了，与句意也不符合。
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