单项选择题

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

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单项选择题
No conclusion has been（） yet.

A. achieved
B. reached
C. attained
D. arrived
单项选择题
I think you'd better （） his advice and rest for a few days.

A. to take
B. taking
C. take
D. took
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