单项选择题

The doctor asked him to take an X-ray in order to ______ the possibility of hip fracture.

A．rule over
B．rule out
C．rule off
D．rule away
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单项选择题
You have no one but yourself to ______ for the fault.
A．accuse
B．blame
C．charge
D．criticize
单项选择题
During his stay in France, he picked ______ quite a bit of French.
A．on
B．up
C．at
D．over
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