单项选择题

AIDS is said ______ the number one killer of both men and women over the past few years in that region.

A．being
B．to be
C．to have been
D．having been
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单项选择题
During the summer holiday season it is difficult to find a(n) ______ room in the hotels here.
A．empty
B．vacant
C．free
D．deserted
单项选择题
The new colleague ______ to have worked in several big corporations before he joined our company.
A．confess
B．declares
C．claims
D．confirms
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