单项选择题

Finding information in today's world is easy. The ______ is how you can tell if the information you get is useful or not.

A. ability
B. competition
C. challenge
D. knowledge
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单项选择题
It was already past midnight and only three young men ______ in the tea house.
A. left
B. remained
C. delayed
D. deserted
单项选择题
In my opinion, she left the letter there ______ so that you'd see it.
A. technically
B. eagerly
C. normally
D. deliberately
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