单项选择题

______ seeing the damage he had done, the child felt ashamed.

A．By
B．On
C．At
D．For
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单项选择题
When the engine would not start, the mechanic inspected all the parts to find what was at ______.
A．wrong
B．trouble
C．fault
D．difficulty
单项选择题
It is well-known that the retired workers in our country are ______ free medical care.
A．entitled to
B．involved in
C．associated with
D．assigned to
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