单项选择题

"I'm surely dirty,（）"

A. am I
B. isn't I
C. aren't I
D. am not I

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单项选择题
We should______with the difficulties we were confronted with.
A. accord
B. acquaint
C. brood
D. contend
单项选择题
Once a picture is proved to be a forgery, it becomes quite______.
A. invaluable
B. priceless
C. unworthy
D. worthless
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