Johan's score on the test is the highest in the group; he ______ last night.
A、
should have studied
B、
must have studied
C、
has studied
D、
should study
【正确答案】
B
【答案解析】
对过去的行为进行肯定推测，应用must have done结构，意为“一定做了某事”，因此B为正确选项。
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