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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She always felt inferior ______ her older sister.
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C．to
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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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