单项选择题

You may make good grades by studying only before examinations, but you will succeed eventually only by studying hard every day.

A．in due course
B．in the long run
C．in the main
D．in the first place
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单项选择题
You should be relieving me of duty at 10: 30, but don't hurry if it's inconvenient; I'll hang on till you arrive.
A．turn on
B．look over
C．keep on
D．take over
单项选择题
Mario was awarded the medal for displaying professional ______ of the highest order in the rescue attempts two weeks ago.
A．solution
B．supervision
C．intelligence
D．competence
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