单项选择题

In the experiment we kept a watchful eye ______ the developments and recorded every detail.

A．in
B．at
C．for
D．on
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单项选择题
I had my eyes tested and the report says that my ______ is perfect.
A．outlook
B．vision
C．horizon
D．perspective
单项选择题
We will go to the courtyard to meet the other ______ of our apartment building.
A．residents
B．vicinity
C．neighbours
D．employees
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