单项选择题
It is only when you nearly lose someone ______ fully conscious of how much you value him.
A. do you become
B. then you become
C. that you become
D. have you become
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单项选择题
Cats sleep ______ day and hunt ______ night.
A. in, in B. at, at
C. during, during D. by, by
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单项选择题
In the long run, English learning, difficult as it is, is ______ to a learner in his or her career development.
A. profitable
B. advantageous
C. prominent
D. rewarding
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