单项选择题

The __________ between rich and poor regions is being bridged.

A．space
B．distance
C．room
D．gap
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The couple never got __________ the loss of their son.
A．over
B．on
C．from
D．down
单项选择题
I still cannot figure __________ the sum I require.
A．in
B．out
C．up
D．over
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