问题
选择题
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
答案：C
题目分析：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。