单项选择题

The hosts apologized for ______ that some of their guests might be vegetarians.

A．having not considered
B．not having considered
C．having not been considering
D．not considering
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单项选择题
______ the popularity of robots in Japan, the country’s robot-production growth is slowing down.
A．As
B．Although
C．With
D．Despite
单项选择题
Not all birds can fly , ______ do all birds build nests.
A．not
B．no
C．never
D．nor
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