单项选择题

The explorers ______ into the unknown regions of the Amazon River.

A．penetrated
B．injected
C．reached
D．stretched
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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
单项选择题
Any student having a ______ interest in sports can apply for membership in the club.
A．sharp
B．keen
C．severe
D．tense
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