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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These computer programs are a ______ to me.
A．problem
B．difficulty
C．puzzle
D．question
单项选择题
The hotel room that we booked for the holidays ______ the city square.
A．tolerated
B．overlooked
C．towered
D．viewed
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