单项选择题

He sat______ his head, trying to think of the answer.

A．scrapping
B．screwing
C．scraping
D．scratching
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单项选择题
We did everything we possibly could to ensure the news report was______.
A．feasible
B．genuine
C．appropriate
D．authentic
单项选择题
The publishing company offers their staff opportunities for______ in decision-making.
A．apprehension
B．appreciation
C．presentation
D．participation
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