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  3. John’s score on the test is the highest in his class, he ______ very hard.

John’s score on the test is the highest in his class, he ______ very hard.

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问题 John’s score on the test is the highest in his class, he ______ very hard.
选项 A、must have studied
B、should have studied
C、must study
D、should study
答案A
解析 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。
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