问题补充:
Tom’s score on the test is the highest in the class. He .
A. should study last night
B. should have studied last night
C. must have studied last night
D. must study last night
答案:
A. should study last night
B. should have studied last night
(答案→)C. must have studied last night
D. must study last night
解析:句意:汤姆的考试成绩是班级最高的,他昨晚一定是学习了。因为是对昨晚事情的推测,所以用情态动词+have done,排除AD,should have done本应该做却没有做,must have done过去一定做了,符合句意,所以选C。