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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单项选择题
It was essential that the application forms ______ back before the deadline.
A．must be sent
B．would be sent
C．be sent
D．were sent
单项选择题
It was felt that he lacked the ______ to pursue a difficult task to the very end.
A．petition
B．engagement
C．commitment
D．qualification
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