A-A+
John's score on the test is the highest in his
问题详情
John"s score on the test is the highest in his class, he ______ very hard.
A. must have studied
B. should have studied
C. must study
D. should study
参考答案
正确答案：A
本题考查虚拟语气的用法。根据题意：John 的考试成绩是最高的，故他肯定考试前努力了。must+have+过去分词，表示对过去的某事作出肯定语气的推测。故选 A。
