单项选择题

There has been a ______ lack of communication between the union and the management.

A．regretful
B．regrettable
C．regretting
D．regretted
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单项选择题
—Does Alan like hamburgers —Yes. So much ______ that he eats them almost every day.
A．for
B．as
C．to
D．so
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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