单项选择题
As far as the professor （）, college students should get into the habit of studying by themselves.
- A．concern
B．concerns
C．concerned
D．is concerned
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A．because
B．since
C．for
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单项选择题
In my bedroom, there is a pair of scissors, a stack of books and （） flowers on my desk.
A．a piece of
B．a pocket of
C．a slice of
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The boy is eager to （） knowledge in different fields.
A．accomplish
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