单项选择题

Rising unemployment is ________ serious problems for the administration.

A．forcing
B．pressing
C．posing
D．providing
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单项选择题
The new colleague ________ to have worked in several big corporations before he joined our company.
A．confesses
B．declares
C．claims
D．confirms
单项选择题
Professor Johnson is said to have made some ________ advance in his research in the past year.
A．extensive
B．significant
C．fundamental
D．dominant
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