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
Have you ever been in a situation _____ you know the other person is right yet you cannot agree with him
A．by which
B．that
C．in where
D．where
单项选择题
For some time now, world leaders _____ out the necessity for agreement on arms reduction.
A．had been pointing
B．have been pointing
C．were pointing
D．pointed
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