单项选择题

__________ impossible to make a living in real estate, Nancy added insurance as a side line.

A．It’s being
B．Its being
C．It is
D．It being
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单项选择题
The __________ horse ran away from the fire.
A．having frightened
B．frightening
C．frightened
D．frighten
单项选择题
The child took a spoonful and tasted it carefully __________ it was hot.
A．in case
B．provided
C．if
D．unless
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