单项选择题

The doctor felt John's arm to ______ if the bone was broken.

A．work out
B．find out
C．look at
D．see out
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单项选择题
The explorers ______ into the unknown regions of the Amazon River.
A．penetrated
B．injected
C．reached
D．stretched
单项选择题
A young student like him cannot have ______.
A．experience of the world
B．the experience of the world
C．the experience of world
D．experience of world
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