单项选择题

He ______ his head, wondering how to solve the problem.

A．scrapped
B．screwed
C．scraped
D．scratched
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单项选择题
They tossed your thoughts back and forth for 6var an hour, but still could not make ______ of them.
A．impression
B．comprehension
C．meaning
D．sense
单项选择题
Although he has had no formal education, he is one of the ______ businessmen in the company.
A．shrewdest
B．sternest
C．nastiest
D．alertest
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